Attachment 343687 Details for Bug 187055 – Patch

[patch] Patch

bug-187055-20180626215528.patch (text/plain), 192.88 KB, created by Chris Dumez on 2018-06-26 21:55:02 PDT

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Creator: Chris Dumez

Created: 2018-06-26 21:55:02 PDT

Size: 192.88 KB

patch

obsolete

>Subversion Revision: 233216
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 82b9a9a393a21854ba8b0c95be4baaf5adf2ba7d..cf20db490f51e0d2612585be9b94c92cda8c0a97 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,183 @@
>+2018-06-26  Chris Dumez  <cdumez@apple.com>
>+
>+        Split memory store logic out of WebResourceLoadStatisticsStore to clarify threading model
>+        https://bugs.webkit.org/show_bug.cgi?id=187055
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        Split memory store logic out of WebResourceLoadStatisticsStore and into a ResourceLoadStatisticsMemoryStore class
>+        to clarify the threading model. Previously, some of the methods of the WebResourceLoadStatisticsStore had to be
>+        called on the main thread and some of them on the background queue, which was confusing and error prone. Now,
>+        all WebResourceLoadStatisticsStore methods (except for IPC ones which will be addressed in a follow-up) are called
>+        on the main thread. The ResourceLoadStatisticsMemoryStore objects is constructed / used and destroyed on the
>+        background queue, similarly to the ResourceLoadStatisticsPersistentStore. The WebResourceLoadStatisticsStore
>+        objects merely proxies calls from WebKit to those persistent / memory stores and takes care of hoping back and
>+        forth between the background thread and the work queue.
>+
>+        While spliting code code, I found several instances where we were calling completion handlers on the wrong thread.
>+        I fixed those in this patch now that the model is clearer.
>+
>+        We can likely clean up (organize the code a bit better) in a follow-up). This patch takes care of splitting the
>+        code as it was. Code that was called on the background queue was moved to ResourceLoadStatisticsMemoryStore class
>+        and code that was called on the main thread stays in WebResourceLoadStatisticsStore.
>+
>+        * CMakeLists.txt:
>+        * UIProcess/Cocoa/ResourceLoadStatisticsMemoryStoreCocoa.mm: Renamed from Source/WebKit/UIProcess/Cocoa/WebResourceLoadStatisticsStoreCocoa.mm.
>+        (WebKit::ResourceLoadStatisticsMemoryStore::registerUserDefaultsIfNeeded):
>+        * UIProcess/ResourceLoadStatisticsMemoryStore.cpp: Added.
>+        (WebKit::appendWithDelimiter):
>+        (WebKit::OperatingDate::fromWallTime):
>+        (WebKit::OperatingDate::today):
>+        (WebKit::OperatingDate::secondsSinceEpoch const):
>+        (WebKit::OperatingDate::operator== const):
>+        (WebKit::OperatingDate::operator< const):
>+        (WebKit::OperatingDate::operator<= const):
>+        (WebKit::OperatingDate::OperatingDate):
>+        (WebKit::mergeOperatingDates):
>+        (WebKit::pruneResources):
>+        (WebKit::computeImportance):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::ResourceLoadStatisticsMemoryStore):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::~ResourceLoadStatisticsMemoryStore):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setPersistentStorage):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::calculateAndSubmitTelemetry):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setNotifyPagesWhenDataRecordsWereScanned):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setShouldClassifyResourcesBeforeDataRecordsRemoval):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setShouldSubmitTelemetry):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::removeDataRecords):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::recursivelyGetAllDomainsThatHaveRedirectedToThisDomain):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::markAsPrevalentIfHasRedirectedToPrevalent):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::processStatisticsAndDataRecords):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::hasStorageAccess):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::requestStorageAccess):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::requestStorageAccessUnderOpener):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::grantStorageAccess):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::grantStorageAccessInternal):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::grandfatherExistingWebsiteData):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setResourceLoadStatisticsDebugMode):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::scheduleStatisticsProcessingRequestIfNecessary):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::cancelPendingStatisticsProcessingRequest):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::logFrameNavigation):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::logUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::logNonRecentUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::clearUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::hasHadUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setPrevalentResource):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isPrevalentResource const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isVeryPrevalentResource const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isRegisteredAsSubFrameUnder):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isRegisteredAsRedirectingTo):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::clearPrevalentResource):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setGrandfathered):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isGrandfathered const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setSubframeUnderTopFrameOrigin):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setSubresourceUnderTopFrameOrigin):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setSubresourceUniqueRedirectTo):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setSubresourceUniqueRedirectFrom):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setTopFrameUniqueRedirectTo):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setTopFrameUniqueRedirectFrom):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setTimeToLiveUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setTimeToLiveCookiePartitionFree):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setMinimumTimeBetweenDataRecordsRemoval):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setGrandfatheringTime):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::shouldRemoveDataRecords const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setDataRecordsBeingRemoved):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::ensureResourceStatisticsForPrimaryDomain):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::createEncoderFromData const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::mergeWithDataFromDecoder):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::clear):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::wasAccessedAsFirstPartyDueToUserInteraction):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::mergeStatistics):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::shouldPartitionCookies):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::shouldBlockCookies):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::hasUserGrantedStorageAccessThroughPrompt):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::updateCookiePartitioning):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::updateCookiePartitioningForDomains):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::clearPartitioningStateForDomains):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::resetCookiePartitioningState):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::processStatistics const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::hasHadUnexpiredRecentUserInteraction const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::topPrivatelyControlledDomainsToRemoveWebsiteDataFor):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::includeTodayAsOperatingDateIfNecessary):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::hasStatisticsExpired const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setMaxStatisticsEntries):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setPruneEntriesDownTo):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::pruneStatisticsIfNeeded):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::resetParametersToDefaultValues):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::logTestingEvent):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setLastSeen):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setVeryPrevalentResource):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::removeAllStorageAccess):
>+        * UIProcess/ResourceLoadStatisticsMemoryStore.h: Added.
>+        (WebKit::ResourceLoadStatisticsMemoryStore::isEmpty const):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setStorageAccessPromptsEnabled):
>+        (WebKit::ResourceLoadStatisticsMemoryStore::setDebugLogggingEnabled):
>+        * UIProcess/ResourceLoadStatisticsPersistentStorage.cpp:
>+        (WebKit::ResourceLoadStatisticsPersistentStorage::ResourceLoadStatisticsPersistentStorage):
>+        (WebKit::ResourceLoadStatisticsPersistentStorage::startMonitoringDisk):
>+        (WebKit::ResourceLoadStatisticsPersistentStorage::monitorDirectoryForNewStatistics):
>+        (WebKit::ResourceLoadStatisticsPersistentStorage::scheduleOrWriteMemoryStore):
>+        * UIProcess/ResourceLoadStatisticsPersistentStorage.h:
>+        * UIProcess/WebResourceLoadStatisticsStore.cpp:
>+        (WebKit::WebResourceLoadStatisticsStore::setNotifyPagesWhenDataRecordsWereScanned):
>+        (WebKit::WebResourceLoadStatisticsStore::setShouldClassifyResourcesBeforeDataRecordsRemoval):
>+        (WebKit::WebResourceLoadStatisticsStore::setShouldSubmitTelemetry):
>+        (WebKit::WebResourceLoadStatisticsStore::WebResourceLoadStatisticsStore):
>+        (WebKit::WebResourceLoadStatisticsStore::flushAndDestroyPersistentStore):
>+        (WebKit::WebResourceLoadStatisticsStore::setResourceLoadStatisticsDebugMode):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleStatisticsAndDataRecordsProcessing):
>+        (WebKit::WebResourceLoadStatisticsStore::resourceLoadStatisticsUpdated):
>+        (WebKit::WebResourceLoadStatisticsStore::hasStorageAccess):
>+        (WebKit::WebResourceLoadStatisticsStore::requestStorageAccess):
>+        (WebKit::WebResourceLoadStatisticsStore::requestStorageAccessUnderOpener):
>+        (WebKit::WebResourceLoadStatisticsStore::grantStorageAccess):
>+        (WebKit::WebResourceLoadStatisticsStore::callGrantStorageAccessHandler):
>+        (WebKit::WebResourceLoadStatisticsStore::removeAllStorageAccess):
>+        (WebKit::WebResourceLoadStatisticsStore::performDailyTasks):
>+        (WebKit::WebResourceLoadStatisticsStore::submitTelemetry):
>+        (WebKit::WebResourceLoadStatisticsStore::logFrameNavigation):
>+        (WebKit::WebResourceLoadStatisticsStore::logUserInteraction):
>+        (WebKit::WebResourceLoadStatisticsStore::logNonRecentUserInteraction):
>+        (WebKit::WebResourceLoadStatisticsStore::clearUserInteraction):
>+        (WebKit::WebResourceLoadStatisticsStore::hasHadUserInteraction):
>+        (WebKit::WebResourceLoadStatisticsStore::setLastSeen):
>+        (WebKit::WebResourceLoadStatisticsStore::setPrevalentResource):
>+        (WebKit::WebResourceLoadStatisticsStore::setVeryPrevalentResource):
>+        (WebKit::WebResourceLoadStatisticsStore::isPrevalentResource):
>+        (WebKit::WebResourceLoadStatisticsStore::isVeryPrevalentResource):
>+        (WebKit::WebResourceLoadStatisticsStore::isRegisteredAsSubFrameUnder):
>+        (WebKit::WebResourceLoadStatisticsStore::isRegisteredAsRedirectingTo):
>+        (WebKit::WebResourceLoadStatisticsStore::clearPrevalentResource):
>+        (WebKit::WebResourceLoadStatisticsStore::setGrandfathered):
>+        (WebKit::WebResourceLoadStatisticsStore::isGrandfathered):
>+        (WebKit::WebResourceLoadStatisticsStore::setSubframeUnderTopFrameOrigin):
>+        (WebKit::WebResourceLoadStatisticsStore::setSubresourceUnderTopFrameOrigin):
>+        (WebKit::WebResourceLoadStatisticsStore::setSubresourceUniqueRedirectTo):
>+        (WebKit::WebResourceLoadStatisticsStore::setSubresourceUniqueRedirectFrom):
>+        (WebKit::WebResourceLoadStatisticsStore::setTopFrameUniqueRedirectTo):
>+        (WebKit::WebResourceLoadStatisticsStore::setTopFrameUniqueRedirectFrom):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleCookiePartitioningUpdate):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleCookiePartitioningUpdateForDomains):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleClearPartitioningStateForDomains):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleCookiePartitioningStateReset):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleClearInMemory):
>+        (WebKit::WebResourceLoadStatisticsStore::scheduleClearInMemoryAndPersistent):
>+        (WebKit::WebResourceLoadStatisticsStore::setTimeToLiveUserInteraction):
>+        (WebKit::WebResourceLoadStatisticsStore::setTimeToLiveCookiePartitionFree):
>+        (WebKit::WebResourceLoadStatisticsStore::setMinimumTimeBetweenDataRecordsRemoval):
>+        (WebKit::WebResourceLoadStatisticsStore::setGrandfatheringTime):
>+        (WebKit::WebResourceLoadStatisticsStore::callUpdatePrevalentDomainsToPartitionOrBlockCookiesHandler):
>+        (WebKit::WebResourceLoadStatisticsStore::callRemoveDomainsHandler):
>+        (WebKit::WebResourceLoadStatisticsStore::setMaxStatisticsEntries):
>+        (WebKit::WebResourceLoadStatisticsStore::setPruneEntriesDownTo):
>+        (WebKit::WebResourceLoadStatisticsStore::resetParametersToDefaultValues):
>+        (WebKit::WebResourceLoadStatisticsStore::logTestingEvent):
>+        * UIProcess/WebResourceLoadStatisticsStore.h:
>+        * UIProcess/WebResourceLoadStatisticsTelemetry.cpp:
>+        (WebKit::sortedPrevalentResourceTelemetry):
>+        (WebKit::WebResourceLoadStatisticsTelemetry::calculateAndSubmit):
>+        * UIProcess/WebResourceLoadStatisticsTelemetry.h:
>+        * WebKit.xcodeproj/project.pbxproj:
>+
> 2018-06-26  Tim Horton  <timothy_horton@apple.com>
> 
>         Promote some experimental features to traditional features
>diff --git a/Source/WebKit/CMakeLists.txt b/Source/WebKit/CMakeLists.txt
>index 422e5242d69e23bf11df69d978329c571b08a186..6cab2d7d70e4eaf824a402af821b85abd8ff3145 100644
>--- a/Source/WebKit/CMakeLists.txt
>+++ b/Source/WebKit/CMakeLists.txt
>@@ -308,6 +308,7 @@ set(WebKit_SOURCES
>     UIProcess/ProcessAssertion.cpp
>     UIProcess/ProcessThrottler.cpp
>     UIProcess/RemoteWebInspectorProxy.cpp
>+    UIProcess/ResourceLoadStatisticsMemoryStore.cpp
>     UIProcess/ResourceLoadStatisticsPersistentStorage.cpp
>     UIProcess/ResponsivenessTimer.cpp
>     UIProcess/ServiceWorkerProcessProxy.cpp
>diff --git a/Source/WebKit/UIProcess/Cocoa/ResourceLoadStatisticsMemoryStoreCocoa.mm b/Source/WebKit/UIProcess/Cocoa/ResourceLoadStatisticsMemoryStoreCocoa.mm
>new file mode 100644
>index 0000000000000000000000000000000000000000..e6b145948bd79c287bf2ed941fd5d11397ce53e1
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/Cocoa/ResourceLoadStatisticsMemoryStoreCocoa.mm
>@@ -0,0 +1,58 @@
>+/*
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#import "config.h"
>+#import "ResourceLoadStatisticsMemoryStore.h"
>+
>+namespace WebKit {
>+
>+void ResourceLoadStatisticsMemoryStore::registerUserDefaultsIfNeeded()
>+{
>+    static dispatch_once_t initOnce;
>+
>+    dispatch_once(&initOnce, ^{
>+        Seconds timeToLiveUserInteraction([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsTimeToLiveUserInteraction"]);
>+        if (timeToLiveUserInteraction > 0_s && timeToLiveUserInteraction <= 24_h * 30)
>+            setTimeToLiveUserInteraction(timeToLiveUserInteraction);
>+
>+        Seconds timeToLiveCookiePartitionFree([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsTimeToLiveCookiePartitionFree"]);
>+        if (timeToLiveCookiePartitionFree > 0_s && timeToLiveCookiePartitionFree <= 24_h)
>+            setTimeToLiveCookiePartitionFree(timeToLiveCookiePartitionFree);
>+
>+        Seconds minimumTimeBetweenDataRecordsRemoval([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsMinimumTimeBetweenDataRecordsRemoval"]);
>+        if (minimumTimeBetweenDataRecordsRemoval > 0_s && minimumTimeBetweenDataRecordsRemoval < 1_h)
>+            setMinimumTimeBetweenDataRecordsRemoval(minimumTimeBetweenDataRecordsRemoval);
>+
>+        Seconds grandfatheringTime([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsGrandfatheringTime"]);
>+        if (grandfatheringTime > 0_s && grandfatheringTime <= 24_h * 7)
>+            setGrandfatheringTime(grandfatheringTime);
>+
>+        setDebugLogggingEnabled([[NSUserDefaults standardUserDefaults] boolForKey:@"ResourceLoadStatisticsDebugLoggingEnabled"]);
>+        setResourceLoadStatisticsDebugMode([[NSUserDefaults standardUserDefaults] boolForKey:@"ExperimentalResourceLoadStatisticsDebugMode"]);
>+        setStorageAccessPromptsEnabled([[NSUserDefaults standardUserDefaults] boolForKey:@"ExperimentalStorageAccessPromptsEnabled"]);
>+    });
>+}
>+
>+}
>diff --git a/Source/WebKit/UIProcess/Cocoa/WebResourceLoadStatisticsStoreCocoa.mm b/Source/WebKit/UIProcess/Cocoa/WebResourceLoadStatisticsStoreCocoa.mm
>deleted file mode 100644
>index fe312c775487955680353cc3ba6cf807b50ea618..0000000000000000000000000000000000000000
>--- a/Source/WebKit/UIProcess/Cocoa/WebResourceLoadStatisticsStoreCocoa.mm
>+++ /dev/null
>@@ -1,58 +0,0 @@
>-/*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>- *
>- * Redistribution and use in source and binary forms, with or without
>- * modification, are permitted provided that the following conditions
>- * are met:
>- * 1. Redistributions of source code must retain the above copyright
>- *    notice, this list of conditions and the following disclaimer.
>- * 2. Redistributions in binary form must reproduce the above copyright
>- *    notice, this list of conditions and the following disclaimer in the
>- *    documentation and/or other materials provided with the distribution.
>- *
>- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>- * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>- * THE POSSIBILITY OF SUCH DAMAGE.
>- */
>-
>-#include "config.h"
>-#import "WebResourceLoadStatisticsStore.h"
>-
>-namespace WebKit {
>-
>-void WebResourceLoadStatisticsStore::registerUserDefaultsIfNeeded()
>-{
>-    static dispatch_once_t initOnce;
>-
>-    dispatch_once(&initOnce, ^ {
>-        Seconds timeToLiveUserInteraction([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsTimeToLiveUserInteraction"]);
>-        if (timeToLiveUserInteraction > 0_s && timeToLiveUserInteraction <= 24_h * 30)
>-            setTimeToLiveUserInteraction(timeToLiveUserInteraction);
>-
>-        Seconds timeToLiveCookiePartitionFree([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsTimeToLiveCookiePartitionFree"]);
>-        if (timeToLiveCookiePartitionFree > 0_s && timeToLiveCookiePartitionFree <= 24_h)
>-            setTimeToLiveCookiePartitionFree(timeToLiveCookiePartitionFree);
>-
>-        Seconds minimumTimeBetweenDataRecordsRemoval([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsMinimumTimeBetweenDataRecordsRemoval"]);
>-        if (minimumTimeBetweenDataRecordsRemoval > 0_s && minimumTimeBetweenDataRecordsRemoval < 1_h)
>-            setMinimumTimeBetweenDataRecordsRemoval(minimumTimeBetweenDataRecordsRemoval);
>-
>-        Seconds grandfatheringTime([[NSUserDefaults standardUserDefaults] doubleForKey:@"ResourceLoadStatisticsGrandfatheringTime"]);
>-        if (grandfatheringTime > 0_s && grandfatheringTime <= 24_h * 7)
>-            setGrandfatheringTime(grandfatheringTime);
>-
>-        setDebugLogggingEnabled([[NSUserDefaults standardUserDefaults] boolForKey:@"ResourceLoadStatisticsDebugLoggingEnabled"]);
>-        setResourceLoadStatisticsDebugMode([[NSUserDefaults standardUserDefaults] boolForKey:@"ExperimentalResourceLoadStatisticsDebugMode"]);
>-        setStorageAccessPromptsEnabled([[NSUserDefaults standardUserDefaults] boolForKey:@"ExperimentalStorageAccessPromptsEnabled"]);
>-    });
>-}
>-
>-}
>diff --git a/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.cpp b/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.cpp
>new file mode 100644
>index 0000000000000000000000000000000000000000..0fa548789921efbb14cbc447cf4e142234a77005
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.cpp
>@@ -0,0 +1,1215 @@
>+/*
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#include "config.h"
>+#include "ResourceLoadStatisticsMemoryStore.h"
>+
>+#include "Logging.h"
>+#include "PluginProcessManager.h"
>+#include "PluginProcessProxy.h"
>+#include "ResourceLoadStatisticsPersistentStorage.h"
>+#include "WebProcessProxy.h"
>+#include "WebResourceLoadStatisticsTelemetry.h"
>+#include "WebsiteDataStore.h"
>+#include <WebCore/KeyedCoding.h>
>+#include <WebCore/ResourceLoadStatistics.h>
>+#include <wtf/DateMath.h>
>+#include <wtf/MathExtras.h>
>+
>+#if !RELEASE_LOG_DISABLED
>+#include <wtf/text/StringBuilder.h>
>+#endif
>+
>+namespace WebKit {
>+
>+using namespace WebCore;
>+
>+constexpr unsigned statisticsModelVersion { 12 };
>+constexpr unsigned maxNumberOfRecursiveCallsInRedirectTraceBack { 50 };
>+constexpr Seconds minimumStatisticsProcessingInterval { 5_s };
>+constexpr unsigned operatingDatesWindow { 30 };
>+constexpr unsigned maxImportance { 3 };
>+
>+#if !RELEASE_LOG_DISABLED
>+static String domainsToString(const Vector<String>& domains)
>+{
>+    StringBuilder builder;
>+    for (auto& domain : domains) {
>+        if (!builder.isEmpty())
>+            builder.appendLiteral(", ");
>+        builder.append(domain);
>+    }
>+    return builder.toString();
>+}
>+#endif
>+
>+class OperatingDate {
>+public:
>+    OperatingDate() = default;
>+
>+    static OperatingDate fromWallTime(WallTime time)
>+    {
>+        double ms = time.secondsSinceEpoch().milliseconds();
>+        int year = msToYear(ms);
>+        int yearDay = dayInYear(ms, year);
>+        int month = monthFromDayInYear(yearDay, isLeapYear(year));
>+        int monthDay = dayInMonthFromDayInYear(yearDay, isLeapYear(year));
>+
>+        return OperatingDate { year, month, monthDay };
>+    }
>+
>+    static OperatingDate today()
>+    {
>+        return OperatingDate::fromWallTime(WallTime::now());
>+    }
>+
>+    Seconds secondsSinceEpoch() const
>+    {
>+        return Seconds { dateToDaysFrom1970(m_year, m_month, m_monthDay) * secondsPerDay };
>+    }
>+
>+    bool operator==(const OperatingDate& other) const
>+    {
>+        return m_monthDay == other.m_monthDay && m_month == other.m_month && m_year == other.m_year;
>+    }
>+
>+    bool operator<(const OperatingDate& other) const
>+    {
>+        return secondsSinceEpoch() < other.secondsSinceEpoch();
>+    }
>+
>+    bool operator<=(const OperatingDate& other) const
>+    {
>+        return secondsSinceEpoch() <= other.secondsSinceEpoch();
>+    }
>+
>+private:
>+    OperatingDate(int year, int month, int monthDay)
>+        : m_year(year)
>+        , m_month(month)
>+        , m_monthDay(monthDay)
>+    { }
>+
>+    int m_year { 0 };
>+    int m_month { 0 }; // [0, 11].
>+    int m_monthDay { 0 }; // [1, 31].
>+};
>+
>+static Vector<OperatingDate> mergeOperatingDates(const Vector<OperatingDate>& existingDates, Vector<OperatingDate>&& newDates)
>+{
>+    if (existingDates.isEmpty())
>+        return WTFMove(newDates);
>+
>+    Vector<OperatingDate> mergedDates(existingDates.size() + newDates.size());
>+
>+    // Merge the two sorted vectors of dates.
>+    std::merge(existingDates.begin(), existingDates.end(), newDates.begin(), newDates.end(), mergedDates.begin());
>+    // Remove duplicate dates.
>+    removeRepeatedElements(mergedDates);
>+
>+    // Drop old dates until the Vector size reaches operatingDatesWindow.
>+    while (mergedDates.size() > operatingDatesWindow)
>+        mergedDates.remove(0);
>+
>+    return mergedDates;
>+}
>+
>+struct StatisticsLastSeen {
>+    String topPrivatelyOwnedDomain;
>+    WallTime lastSeen;
>+};
>+
>+static void pruneResources(HashMap<String, WebCore::ResourceLoadStatistics>& statisticsMap, Vector<StatisticsLastSeen>& statisticsToPrune, size_t& numberOfEntriesToPrune)
>+{
>+    if (statisticsToPrune.size() > numberOfEntriesToPrune) {
>+        std::sort(statisticsToPrune.begin(), statisticsToPrune.end(), [](const StatisticsLastSeen& a, const StatisticsLastSeen& b) {
>+            return a.lastSeen < b.lastSeen;
>+        });
>+    }
>+
>+    for (size_t i = 0, end = std::min(numberOfEntriesToPrune, statisticsToPrune.size()); i != end; ++i, --numberOfEntriesToPrune)
>+        statisticsMap.remove(statisticsToPrune[i].topPrivatelyOwnedDomain);
>+}
>+
>+static unsigned computeImportance(const ResourceLoadStatistics& resourceStatistic)
>+{
>+    unsigned importance = maxImportance;
>+    if (!resourceStatistic.isPrevalentResource)
>+        importance -= 1;
>+    if (!resourceStatistic.hadUserInteraction)
>+        importance -= 2;
>+    return importance;
>+}
>+
>+ResourceLoadStatisticsMemoryStore::ResourceLoadStatisticsMemoryStore(WebResourceLoadStatisticsStore& store, WorkQueue& workQueue)
>+    : m_store(store)
>+    , m_workQueue(workQueue)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+#if PLATFORM(COCOA)
>+    registerUserDefaultsIfNeeded();
>+#endif
>+    includeTodayAsOperatingDateIfNecessary();
>+}
>+
>+ResourceLoadStatisticsMemoryStore::~ResourceLoadStatisticsMemoryStore()
>+{
>+    ASSERT(!RunLoop::isMain());
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setPersistentStorage(ResourceLoadStatisticsPersistentStorage& persistentStorage)
>+{
>+    m_persistentStorage = makeWeakPtr(persistentStorage);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::calculateAndSubmitTelemetry() const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (m_parameters.shouldSubmitTelemetry)
>+        WebResourceLoadStatisticsTelemetry::calculateAndSubmit(*this);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setNotifyPagesWhenDataRecordsWereScanned(bool value)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned = value;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setShouldClassifyResourcesBeforeDataRecordsRemoval(bool value)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    m_parameters.shouldClassifyResourcesBeforeDataRecordsRemoval = value;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setShouldSubmitTelemetry(bool value)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    m_parameters.shouldSubmitTelemetry = value;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::removeDataRecords(CompletionHandler<void()>&& callback)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (!shouldRemoveDataRecords()) {
>+        callback();
>+        return;
>+    }
>+
>+#if ENABLE(NETSCAPE_PLUGIN_API)
>+    m_activePluginTokens.clear();
>+    for (auto plugin : PluginProcessManager::singleton().pluginProcesses())
>+        m_activePluginTokens.add(plugin->pluginProcessToken());
>+#endif
>+
>+    auto prevalentResourceDomains = topPrivatelyControlledDomainsToRemoveWebsiteDataFor();
>+    if (prevalentResourceDomains.isEmpty()) {
>+        callback();
>+        return;
>+    }
>+
>+#if !RELEASE_LOG_DISABLED
>+    if (m_debugLoggingEnabled)
>+        RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to remove data records for %{public}s.", domainsToString(prevalentResourceDomains).utf8().data());
>+#endif
>+
>+    setDataRecordsBeingRemoved(true);
>+
>+    RunLoop::main().dispatch([prevalentResourceDomains = crossThreadCopy(prevalentResourceDomains), callback = WTFMove(callback), this, weakThis = makeWeakPtr(*this)] () mutable {
>+        WebProcessProxy::deleteWebsiteDataForTopPrivatelyControlledDomainsInAllPersistentDataStores(WebResourceLoadStatisticsStore::monitoredDataTypes(), WTFMove(prevalentResourceDomains), m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned, [callback = WTFMove(callback), this, weakThis = WTFMove(weakThis)](const HashSet<String>& domainsWithDeletedWebsiteData) mutable {
>+            m_workQueue->dispatch([topDomains = crossThreadCopy(domainsWithDeletedWebsiteData), callback = WTFMove(callback), this, weakThis = WTFMove(weakThis)] () mutable {
>+                if (!weakThis) {
>+                    callback();
>+                    return;
>+                }
>+                for (auto& prevalentResourceDomain : topDomains) {
>+                    auto& statistic = ensureResourceStatisticsForPrimaryDomain(prevalentResourceDomain);
>+                    ++statistic.dataRecordsRemoved;
>+                }
>+                setDataRecordsBeingRemoved(false);
>+                callback();
>+#if !RELEASE_LOG_DISABLED
>+                RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Done removing data records.");
>+#endif
>+            });
>+        });
>+    });
>+}
>+
>+unsigned ResourceLoadStatisticsMemoryStore::recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(const WebCore::ResourceLoadStatistics& resourceStatistic, HashSet<String>& domainsThatHaveRedirectedTo, unsigned numberOfRecursiveCalls) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (numberOfRecursiveCalls >= maxNumberOfRecursiveCallsInRedirectTraceBack) {
>+        ASSERT_NOT_REACHED();
>+        WTFLogAlways("Hit %u recursive calls in redirect backtrace. Returning early.", maxNumberOfRecursiveCallsInRedirectTraceBack);
>+        return numberOfRecursiveCalls;
>+    }
>+
>+    numberOfRecursiveCalls++;
>+
>+    for (auto& subresourceUniqueRedirectFromDomain : resourceStatistic.subresourceUniqueRedirectsFrom.values()) {
>+        auto mapEntry = m_resourceStatisticsMap.find(subresourceUniqueRedirectFromDomain);
>+        if (mapEntry == m_resourceStatisticsMap.end() || mapEntry->value.isPrevalentResource)
>+            continue;
>+        if (domainsThatHaveRedirectedTo.add(mapEntry->value.highLevelDomain).isNewEntry)
>+            numberOfRecursiveCalls = recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(mapEntry->value, domainsThatHaveRedirectedTo, numberOfRecursiveCalls);
>+    }
>+    for (auto& topFrameUniqueRedirectFromDomain : resourceStatistic.topFrameUniqueRedirectsFrom.values()) {
>+        auto mapEntry = m_resourceStatisticsMap.find(topFrameUniqueRedirectFromDomain);
>+        if (mapEntry == m_resourceStatisticsMap.end() || mapEntry->value.isPrevalentResource)
>+            continue;
>+        if (domainsThatHaveRedirectedTo.add(mapEntry->value.highLevelDomain).isNewEntry)
>+            numberOfRecursiveCalls = recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(mapEntry->value, domainsThatHaveRedirectedTo, numberOfRecursiveCalls);
>+    }
>+
>+    return numberOfRecursiveCalls;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::markAsPrevalentIfHasRedirectedToPrevalent(WebCore::ResourceLoadStatistics& resourceStatistic)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (resourceStatistic.isPrevalentResource)
>+        return;
>+
>+    for (auto& subresourceDomainRedirectedTo : resourceStatistic.subresourceUniqueRedirectsTo.values()) {
>+        auto mapEntry = m_resourceStatisticsMap.find(subresourceDomainRedirectedTo);
>+        if (mapEntry != m_resourceStatisticsMap.end() && mapEntry->value.isPrevalentResource) {
>+            setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>+            return;
>+        }
>+    }
>+
>+    for (auto& topFrameDomainRedirectedTo : resourceStatistic.topFrameUniqueRedirectsTo.values()) {
>+        auto mapEntry = m_resourceStatisticsMap.find(topFrameDomainRedirectedTo);
>+        if (mapEntry != m_resourceStatisticsMap.end() && mapEntry->value.isPrevalentResource) {
>+            setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>+            return;
>+        }
>+    }
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::processStatisticsAndDataRecords()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (m_parameters.shouldClassifyResourcesBeforeDataRecordsRemoval) {
>+        for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>+            if (!resourceStatistic.isVeryPrevalentResource) {
>+                markAsPrevalentIfHasRedirectedToPrevalent(resourceStatistic);
>+                auto currentPrevalence = resourceStatistic.isPrevalentResource ? ResourceLoadPrevalence::High : ResourceLoadPrevalence::Low;
>+                auto newPrevalence = m_resourceLoadStatisticsClassifier.calculateResourcePrevalence(resourceStatistic, currentPrevalence);
>+                if (newPrevalence != currentPrevalence)
>+                    setPrevalentResource(resourceStatistic, newPrevalence);
>+            }
>+        }
>+    }
>+
>+    if (m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned) {
>+        removeDataRecords([this, weakThis = makeWeakPtr(*this)] {
>+            ASSERT(!RunLoop::isMain());
>+            if (!weakThis)
>+                return;
>+
>+            pruneStatisticsIfNeeded();
>+            if (m_persistentStorage)
>+                m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::No);
>+
>+            RunLoop::main().dispatch([] {
>+                WebProcessProxy::notifyPageStatisticsAndDataRecordsProcessed();
>+            });
>+        });
>+    } else {
>+        removeDataRecords([this, weakThis = makeWeakPtr(*this)] {
>+            ASSERT(!RunLoop::isMain());
>+            if (!weakThis)
>+                return;
>+
>+            pruneStatisticsIfNeeded();
>+            if (m_persistentStorage)
>+                m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::No);
>+        });
>+    }
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::hasStorageAccess(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain, uint64_t frameID, uint64_t pageID, CompletionHandler<void(bool)>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>+    if (shouldBlockCookies(subFrameStatistic)) {
>+        completionHandler(false);
>+        return;
>+    }
>+
>+    if (!shouldPartitionCookies(subFrameStatistic)) {
>+        completionHandler(true);
>+        return;
>+    }
>+
>+    RunLoop::main().dispatch([store = makeRef(m_store), subFramePrimaryDomain = subFramePrimaryDomain.isolatedCopy(), topFramePrimaryDomain = topFramePrimaryDomain.isolatedCopy(), frameID, pageID, completionHandler = WTFMove(completionHandler)]() mutable {
>+        store->callHasStorageAccessForFrameHandler(subFramePrimaryDomain, topFramePrimaryDomain, frameID, pageID, [store = store.copyRef(), completionHandler = WTFMove(completionHandler)](bool result) mutable {
>+            store->statisticsQueue().dispatch([completionHandler = WTFMove(completionHandler), result] {
>+                completionHandler(result);
>+            });
>+        });
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::requestStorageAccess(String&& subFramePrimaryDomain, String&& topFramePrimaryDomain, uint64_t frameID, uint64_t pageID, bool promptEnabled, CompletionHandler<void(StorageAccessStatus)>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>+    if (shouldBlockCookies(subFrameStatistic)) {
>+        completionHandler(StorageAccessStatus::CannotRequestAccess);
>+        return;
>+    }
>+
>+    if (!shouldPartitionCookies(subFrameStatistic)) {
>+        completionHandler(StorageAccessStatus::HasAccess);
>+        return;
>+    }
>+
>+    auto userWasPromptedEarlier = promptEnabled && hasUserGrantedStorageAccessThroughPrompt(subFrameStatistic, topFramePrimaryDomain);
>+    if (promptEnabled && !userWasPromptedEarlier) {
>+        completionHandler(StorageAccessStatus::RequiresUserPrompt);
>+        return;
>+    }
>+
>+    subFrameStatistic.timesAccessedAsFirstPartyDueToStorageAccessAPI++;
>+
>+    grantStorageAccessInternal(WTFMove(subFramePrimaryDomain), WTFMove(topFramePrimaryDomain), frameID, pageID, userWasPromptedEarlier, [completionHandler = WTFMove(completionHandler)] (bool wasGrantedAccess) mutable {
>+        completionHandler(wasGrantedAccess ? StorageAccessStatus::HasAccess : StorageAccessStatus::CannotRequestAccess);
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::requestStorageAccessUnderOpener(String&& primaryDomainInNeedOfStorageAccess, uint64_t openerPageID, String&& openerPrimaryDomain, bool isTriggeredByUserGesture)
>+{
>+    ASSERT(primaryDomainInNeedOfStorageAccess != openerPrimaryDomain);
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (primaryDomainInNeedOfStorageAccess == openerPrimaryDomain)
>+        return;
>+
>+    auto& domainInNeedOfStorageAccessStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomainInNeedOfStorageAccess);
>+    auto cookiesBlocked = shouldBlockCookies(domainInNeedOfStorageAccessStatistic);
>+
>+    // There are no cookies to get access to if the domain has its cookies blocked and did not get user interaction now.
>+    if (cookiesBlocked && !isTriggeredByUserGesture)
>+        return;
>+
>+    // The domain already has access if its cookies are neither blocked nor partitioned.
>+    if (!cookiesBlocked && !shouldPartitionCookies(domainInNeedOfStorageAccessStatistic))
>+        return;
>+
>+#if !RELEASE_LOG_DISABLED
>+    RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Grant storage access for %{public}s under opener %{public}s, %{public}s user interaction.", primaryDomainInNeedOfStorageAccess.utf8().data(), openerPrimaryDomain.utf8().data(), (isTriggeredByUserGesture ? "with" : "without"));
>+#endif
>+    grantStorageAccessInternal(WTFMove(primaryDomainInNeedOfStorageAccess), WTFMove(openerPrimaryDomain), std::nullopt, openerPageID, false, [](bool) { });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::grantStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool userWasPromptedNow, CompletionHandler<void(bool)>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto subFramePrimaryDomain = ResourceLoadStatistics::primaryDomain(subFrameHost);
>+    auto topFramePrimaryDomain = ResourceLoadStatistics::primaryDomain(topFrameHost);
>+    if (userWasPromptedNow) {
>+        auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>+        ASSERT(subFrameStatistic.hadUserInteraction);
>+        subFrameStatistic.storageAccessUnderTopFrameOrigins.add(topFramePrimaryDomain);
>+    }
>+    grantStorageAccessInternal(WTFMove(subFrameHost), WTFMove(topFrameHost), frameID, pageID, userWasPromptedNow, WTFMove(completionHandler));
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::grantStorageAccessInternal(String&& subFramePrimaryDomain, String&& topFramePrimaryDomain, std::optional<uint64_t> frameID, uint64_t pageID, bool userWasPromptedNowOrEarlier, CompletionHandler<void(bool)>&& callback)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (subFramePrimaryDomain == topFramePrimaryDomain) {
>+        callback(true);
>+        return;
>+    }
>+
>+    // FIXME: Remove m_storageAccessPromptsEnabled check if prompting is no longer experimental.
>+    if (userWasPromptedNowOrEarlier && m_storageAccessPromptsEnabled) {
>+        auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>+        ASSERT(subFrameStatistic.hadUserInteraction);
>+        ASSERT(subFrameStatistic.storageAccessUnderTopFrameOrigins.contains(topFramePrimaryDomain));
>+        subFrameStatistic.mostRecentUserInteractionTime = WallTime::now();
>+    }
>+
>+    RunLoop::main().dispatch([subFramePrimaryDomain = subFramePrimaryDomain.isolatedCopy(), topFramePrimaryDomain = topFramePrimaryDomain.isolatedCopy(), frameID, pageID, store = makeRef(m_store), callback = WTFMove(callback)]() mutable {
>+        store->callGrantStorageAccessHandler(subFramePrimaryDomain, topFramePrimaryDomain, frameID, pageID, [callback = WTFMove(callback), store = store.copyRef()](bool value) mutable {
>+            store->statisticsQueue().dispatch([callback = WTFMove(callback), value] {
>+                callback(value);
>+            });
>+        });
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::grandfatherExistingWebsiteData(CompletionHandler<void()>&& callback)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    RunLoop::main().dispatch([this, weakThis = makeWeakPtr(*this), callback = WTFMove(callback)] () mutable {
>+        // FIXME: This method being a static call on WebProcessProxy is wrong.
>+        // It should be on the data store that this object belongs to.
>+        WebProcessProxy::topPrivatelyControlledDomainsWithWebsiteData(WebResourceLoadStatisticsStore::monitoredDataTypes(), m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned, [this, weakThis = WTFMove(weakThis), callback = WTFMove(callback)] (HashSet<String>&& topPrivatelyControlledDomainsWithWebsiteData) mutable {
>+            m_workQueue->dispatch([this, weakThis = WTFMove(weakThis), topDomains = crossThreadCopy(topPrivatelyControlledDomainsWithWebsiteData), callback = WTFMove(callback)] () mutable {
>+                if (!weakThis) {
>+                    callback();
>+                    return;
>+                }
>+
>+                for (auto& topPrivatelyControlledDomain : topDomains) {
>+                    auto& statistic = ensureResourceStatisticsForPrimaryDomain(topPrivatelyControlledDomain);
>+                    statistic.grandfathered = true;
>+                }
>+                m_endOfGrandfatheringTimestamp = WallTime::now() + m_parameters.grandfatheringTime;
>+                if (m_persistentStorage)
>+                    m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::Yes);
>+                callback();
>+                logTestingEvent("Grandfathered"_s);
>+            });
>+        });
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setResourceLoadStatisticsDebugMode(bool enable)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_debugModeEnabled = enable;
>+#if !RELEASE_LOG_DISABLED
>+    RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "ITP Debug Mode %{public}s.", (m_debugModeEnabled ? "enabled" : "disabled"));
>+#endif
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::scheduleStatisticsProcessingRequestIfNecessary()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_pendingStatisticsProcessingRequestIdentifier = ++m_lastStatisticsProcessingRequestIdentifier;
>+    m_workQueue->dispatchAfter(minimumStatisticsProcessingInterval, [this, weakThis = makeWeakPtr(*this), statisticsProcessingRequestIdentifier = *m_pendingStatisticsProcessingRequestIdentifier] {
>+        if (!weakThis)
>+            return;
>+
>+        if (!m_pendingStatisticsProcessingRequestIdentifier || *m_pendingStatisticsProcessingRequestIdentifier != statisticsProcessingRequestIdentifier) {
>+            // This request has been canceled.
>+            return;
>+        }
>+
>+        updateCookiePartitioning([]() { });
>+        processStatisticsAndDataRecords();
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::cancelPendingStatisticsProcessingRequest()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_pendingStatisticsProcessingRequestIdentifier = std::nullopt;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::logFrameNavigation(const String& targetPrimaryDomain, const String& mainFramePrimaryDomain, const String& sourcePrimaryDomain, const String& targetHost, const String& mainFrameHost, bool areTargetAndMainFrameDomainsAssociated, bool areTargetAndSourceDomainsAssociated, bool isRedirect, bool isMainFrame)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    bool statisticsWereUpdated = false;
>+    if (targetHost != mainFrameHost && !(areTargetAndMainFrameDomainsAssociated || areTargetAndSourceDomainsAssociated)) {
>+        auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>+        targetStatistics.lastSeen = ResourceLoadStatistics::reduceTimeResolution(WallTime::now());
>+        if (targetStatistics.subframeUnderTopFrameOrigins.add(mainFramePrimaryDomain).isNewEntry)
>+            statisticsWereUpdated = true;
>+    }
>+
>+    if (isRedirect && !areTargetAndSourceDomainsAssociated) {
>+        if (isMainFrame) {
>+            auto& redirectingOriginStatistics = ensureResourceStatisticsForPrimaryDomain(sourcePrimaryDomain);
>+            if (redirectingOriginStatistics.topFrameUniqueRedirectsTo.add(targetPrimaryDomain).isNewEntry)
>+                statisticsWereUpdated = true;
>+            auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>+            if (targetStatistics.topFrameUniqueRedirectsFrom.add(sourcePrimaryDomain).isNewEntry)
>+                statisticsWereUpdated = true;
>+        } else {
>+            auto& redirectingOriginStatistics = ensureResourceStatisticsForPrimaryDomain(sourcePrimaryDomain);
>+            if (redirectingOriginStatistics.subresourceUniqueRedirectsTo.add(targetPrimaryDomain).isNewEntry)
>+                statisticsWereUpdated = true;
>+            auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>+            if (targetStatistics.subresourceUniqueRedirectsFrom.add(sourcePrimaryDomain).isNewEntry)
>+                statisticsWereUpdated = true;
>+        }
>+    }
>+
>+    if (statisticsWereUpdated)
>+        scheduleStatisticsProcessingRequestIfNecessary();
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::logUserInteraction(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.hadUserInteraction = true;
>+    statistics.mostRecentUserInteractionTime = WallTime::now();
>+
>+    if (statistics.isMarkedForCookieBlocking)
>+        updateCookiePartitioningForDomains({ primaryDomain }, { }, { }, ShouldClearFirst::No, []() { });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::logNonRecentUserInteraction(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.hadUserInteraction = true;
>+    statistics.mostRecentUserInteractionTime = WallTime::now() - (m_parameters.timeToLiveCookiePartitionFree + Seconds::fromHours(1));
>+
>+    updateCookiePartitioningForDomains({ primaryDomain }, { }, { }, ShouldClearFirst::No, []() { });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::clearUserInteraction(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.hadUserInteraction = false;
>+    statistics.mostRecentUserInteractionTime = { };
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::hasHadUserInteraction(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false: hasHadUnexpiredRecentUserInteraction(mapEntry->value);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setPrevalentResource(WebCore::ResourceLoadStatistics& resourceStatistic, ResourceLoadPrevalence newPrevalence)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    resourceStatistic.isPrevalentResource = true;
>+    resourceStatistic.isVeryPrevalentResource = newPrevalence == ResourceLoadPrevalence::VeryHigh;
>+    HashSet<String> domainsThatHaveRedirectedTo;
>+    recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(resourceStatistic, domainsThatHaveRedirectedTo, 0);
>+    for (auto& domain : domainsThatHaveRedirectedTo) {
>+        auto mapEntry = m_resourceStatisticsMap.find(domain);
>+        if (mapEntry == m_resourceStatisticsMap.end())
>+            continue;
>+        ASSERT(!mapEntry->value.isPrevalentResource);
>+        mapEntry->value.isPrevalentResource = true;
>+    }
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::isPrevalentResource(const String& primaryDomain) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.isPrevalentResource;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::isVeryPrevalentResource(const String& primaryDomain) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.isPrevalentResource && mapEntry->value.isVeryPrevalentResource;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::isRegisteredAsSubFrameUnder(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(subFramePrimaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.subframeUnderTopFrameOrigins.contains(topFramePrimaryDomain);
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::isRegisteredAsRedirectingTo(const String& hostRedirectedFromPrimaryDomain, const String& hostRedirectedToPrimaryDomain) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(hostRedirectedFromPrimaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.subresourceUniqueRedirectsTo.contains(hostRedirectedToPrimaryDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::clearPrevalentResource(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.isPrevalentResource = false;
>+    statistics.isVeryPrevalentResource = false;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setGrandfathered(const String& primaryDomain, bool value)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.grandfathered = value;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::isGrandfathered(const String& primaryDomain) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>+    return mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.grandfathered;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setSubframeUnderTopFrameOrigin(const String& primarySubFrameDomain, const String& primaryTopFrameDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubFrameDomain);
>+    statistics.subframeUnderTopFrameOrigins.add(primaryTopFrameDomain);
>+    // For consistency, make sure we also have a statistics entry for the top frame domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryTopFrameDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setSubresourceUnderTopFrameOrigin(const String& primarySubresourceDomain, const String& primaryTopFrameDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>+    statistics.subresourceUnderTopFrameOrigins.add(primaryTopFrameDomain);
>+    // For consistency, make sure we also have a statistics entry for the top frame domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryTopFrameDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setSubresourceUniqueRedirectTo(const String& primarySubresourceDomain, const String& primaryRedirectDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>+    statistics.subresourceUniqueRedirectsTo.add(primaryRedirectDomain);
>+    // For consistency, make sure we also have a statistics entry for the redirect domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setSubresourceUniqueRedirectFrom(const String& primarySubresourceDomain, const String& primaryRedirectDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>+    statistics.subresourceUniqueRedirectsFrom.add(primaryRedirectDomain);
>+    // For consistency, make sure we also have a statistics entry for the redirect domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setTopFrameUniqueRedirectTo(const String& topFramePrimaryDomain, const String& primaryRedirectDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(topFramePrimaryDomain);
>+    statistics.topFrameUniqueRedirectsTo.add(primaryRedirectDomain);
>+    // For consistency, make sure we also have a statistics entry for the redirect domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setTopFrameUniqueRedirectFrom(const String& topFramePrimaryDomain, const String& primaryRedirectDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(topFramePrimaryDomain);
>+    statistics.topFrameUniqueRedirectsFrom.add(primaryRedirectDomain);
>+    // For consistency, make sure we also have a statistics entry for the redirect domain.
>+    ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setTimeToLiveUserInteraction(Seconds seconds)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    ASSERT(seconds >= 0_s);
>+
>+    m_parameters.timeToLiveUserInteraction = seconds;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setTimeToLiveCookiePartitionFree(Seconds seconds)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    ASSERT(seconds >= 0_s);
>+
>+    m_parameters.timeToLiveCookiePartitionFree = seconds;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setMinimumTimeBetweenDataRecordsRemoval(Seconds seconds)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    ASSERT(seconds >= 0_s);
>+
>+    m_parameters.minimumTimeBetweenDataRecordsRemoval = seconds;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setGrandfatheringTime(Seconds seconds)
>+{
>+    ASSERT(!RunLoop::isMain());
>+    ASSERT(seconds >= 0_s);
>+
>+    m_parameters.grandfatheringTime = seconds;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::shouldRemoveDataRecords() const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (m_dataRecordsBeingRemoved)
>+        return false;
>+
>+#if ENABLE(NETSCAPE_PLUGIN_API)
>+    for (auto plugin : PluginProcessManager::singleton().pluginProcesses()) {
>+        if (!m_activePluginTokens.contains(plugin->pluginProcessToken()))
>+            return true;
>+    }
>+#endif
>+
>+    return !m_lastTimeDataRecordsWereRemoved || MonotonicTime::now() >= (m_lastTimeDataRecordsWereRemoved + m_parameters.minimumTimeBetweenDataRecordsRemoval);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setDataRecordsBeingRemoved(bool value)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_dataRecordsBeingRemoved = value;
>+    if (m_dataRecordsBeingRemoved)
>+        m_lastTimeDataRecordsWereRemoved = MonotonicTime::now();
>+}
>+
>+ResourceLoadStatistics& ResourceLoadStatisticsMemoryStore::ensureResourceStatisticsForPrimaryDomain(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    return m_resourceStatisticsMap.ensure(primaryDomain, [&primaryDomain] {
>+        return ResourceLoadStatistics(primaryDomain);
>+    }).iterator->value;
>+}
>+
>+std::unique_ptr<KeyedEncoder> ResourceLoadStatisticsMemoryStore::createEncoderFromData() const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto encoder = KeyedEncoder::encoder();
>+    encoder->encodeUInt32("version", statisticsModelVersion);
>+    encoder->encodeDouble("endOfGrandfatheringTimestamp", m_endOfGrandfatheringTimestamp.secondsSinceEpoch().value());
>+
>+    encoder->encodeObjects("browsingStatistics", m_resourceStatisticsMap.begin(), m_resourceStatisticsMap.end(), [](KeyedEncoder& encoderInner, const auto& origin) {
>+        origin.value.encode(encoderInner);
>+    });
>+
>+    encoder->encodeObjects("operatingDates", m_operatingDates.begin(), m_operatingDates.end(), [](KeyedEncoder& encoderInner, OperatingDate date) {
>+        encoderInner.encodeDouble("date", date.secondsSinceEpoch().value());
>+    });
>+
>+    return encoder;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::mergeWithDataFromDecoder(KeyedDecoder& decoder)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    unsigned versionOnDisk;
>+    if (!decoder.decodeUInt32("version", versionOnDisk))
>+        return;
>+
>+    if (versionOnDisk > statisticsModelVersion) {
>+        WTFLogAlways("Found resource load statistics on disk with model version %u whereas the highest supported version is %u. Resetting.", versionOnDisk, statisticsModelVersion);
>+        return;
>+    }
>+
>+    double endOfGrandfatheringTimestamp;
>+    if (decoder.decodeDouble("endOfGrandfatheringTimestamp", endOfGrandfatheringTimestamp))
>+        m_endOfGrandfatheringTimestamp = WallTime::fromRawSeconds(endOfGrandfatheringTimestamp);
>+    else
>+        m_endOfGrandfatheringTimestamp = { };
>+
>+    Vector<ResourceLoadStatistics> loadedStatistics;
>+    bool succeeded = decoder.decodeObjects("browsingStatistics", loadedStatistics, [versionOnDisk](KeyedDecoder& decoderInner, ResourceLoadStatistics& statistics) {
>+        return statistics.decode(decoderInner, versionOnDisk);
>+    });
>+
>+    if (!succeeded)
>+        return;
>+
>+    mergeStatistics(WTFMove(loadedStatistics));
>+    updateCookiePartitioning([]() { });
>+
>+    Vector<OperatingDate> operatingDates;
>+    succeeded = decoder.decodeObjects("operatingDates", operatingDates, [](KeyedDecoder& decoder, OperatingDate& date) {
>+        double value;
>+        if (!decoder.decodeDouble("date", value))
>+            return false;
>+
>+        date = OperatingDate::fromWallTime(WallTime::fromRawSeconds(value));
>+        return true;
>+    });
>+
>+    if (!succeeded)
>+        return;
>+
>+    m_operatingDates = mergeOperatingDates(m_operatingDates, WTFMove(operatingDates));
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::clear()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_resourceStatisticsMap.clear();
>+    m_operatingDates.clear();
>+
>+    removeAllStorageAccess();
>+    updateCookiePartitioningForDomains({ }, { }, { }, ShouldClearFirst::Yes, []() { });
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::wasAccessedAsFirstPartyDueToUserInteraction(const ResourceLoadStatistics& current, const ResourceLoadStatistics& updated) const
>+{
>+    if (!current.hadUserInteraction && !updated.hadUserInteraction)
>+        return false;
>+
>+    auto mostRecentUserInteractionTime = std::max(current.mostRecentUserInteractionTime, updated.mostRecentUserInteractionTime);
>+
>+    return updated.lastSeen <= mostRecentUserInteractionTime + m_parameters.timeToLiveCookiePartitionFree;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::mergeStatistics(Vector<ResourceLoadStatistics>&& statistics)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    for (auto& statistic : statistics) {
>+        auto result = m_resourceStatisticsMap.ensure(statistic.highLevelDomain, [&statistic] {
>+            return WTFMove(statistic);
>+        });
>+        if (!result.isNewEntry) {
>+            if (wasAccessedAsFirstPartyDueToUserInteraction(result.iterator->value, statistic))
>+                result.iterator->value.timesAccessedAsFirstPartyDueToUserInteraction++;
>+            result.iterator->value.merge(statistic);
>+        }
>+    }
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::shouldPartitionCookies(const ResourceLoadStatistics& statistic)
>+{
>+    return statistic.isPrevalentResource && statistic.hadUserInteraction;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::shouldBlockCookies(const ResourceLoadStatistics& statistic)
>+{
>+    return statistic.isPrevalentResource && !statistic.hadUserInteraction;
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::hasUserGrantedStorageAccessThroughPrompt(const ResourceLoadStatistics& statistic, const String& firstPartyPrimaryDomain)
>+{
>+    return statistic.storageAccessUnderTopFrameOrigins.contains(firstPartyPrimaryDomain);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::updateCookiePartitioning(CompletionHandler<void()>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    Vector<String> domainsToPartition;
>+    Vector<String> domainsToBlock;
>+    Vector<String> domainsToNeitherPartitionNorBlock;
>+    for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>+
>+        bool shouldPartition = shouldPartitionCookies(resourceStatistic);
>+        bool shouldBlock = shouldBlockCookies(resourceStatistic);
>+
>+        if (shouldPartition && !resourceStatistic.isMarkedForCookiePartitioning) {
>+            domainsToPartition.append(resourceStatistic.highLevelDomain);
>+            resourceStatistic.isMarkedForCookiePartitioning = true;
>+        } else if (shouldBlock && !resourceStatistic.isMarkedForCookieBlocking) {
>+            domainsToBlock.append(resourceStatistic.highLevelDomain);
>+            resourceStatistic.isMarkedForCookieBlocking = true;
>+        } else if (!shouldPartition && !shouldBlock && resourceStatistic.isPrevalentResource) {
>+            domainsToNeitherPartitionNorBlock.append(resourceStatistic.highLevelDomain);
>+            resourceStatistic.isMarkedForCookiePartitioning = false;
>+            resourceStatistic.isMarkedForCookieBlocking = false;
>+        }
>+    }
>+
>+    if (domainsToPartition.isEmpty() && domainsToBlock.isEmpty() && domainsToNeitherPartitionNorBlock.isEmpty()) {
>+        completionHandler();
>+        return;
>+    }
>+
>+#if !RELEASE_LOG_DISABLED
>+    if (m_debugLoggingEnabled) {
>+        if (!domainsToPartition.isEmpty())
>+            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to partition cookies in third-party contexts for %{public}s.", domainsToString(domainsToPartition).utf8().data());
>+        if (!domainsToBlock.isEmpty())
>+            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to block cookies in third-party contexts for %{public}s.", domainsToString(domainsToBlock).utf8().data());
>+        if (!domainsToNeitherPartitionNorBlock.isEmpty())
>+            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to neither partition nor block cookies in third-party contexts for %{public}s.", domainsToString(domainsToNeitherPartitionNorBlock).utf8().data());
>+    }
>+#endif
>+
>+    RunLoop::main().dispatch([this, store = makeRef(m_store), domainsToPartition = crossThreadCopy(domainsToPartition), domainsToBlock = crossThreadCopy(domainsToBlock), domainsToNeitherPartitionNorBlock = crossThreadCopy(domainsToNeitherPartitionNorBlock), completionHandler = WTFMove(completionHandler)] () mutable {
>+        store->callUpdatePrevalentDomainsToPartitionOrBlockCookiesHandler(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, ShouldClearFirst::No, [this, store = store.copyRef(), completionHandler = WTFMove(completionHandler)]() mutable {
>+            store->statisticsQueue().dispatch([this, completionHandler = WTFMove(completionHandler)] {
>+                completionHandler();
>+
>+#if !RELEASE_LOG_DISABLED
>+                RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Done updating cookie partitioning and blocking.");
>+#endif
>+            });
>+        });
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::updateCookiePartitioningForDomains(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst shouldClearFirst, CompletionHandler<void()>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (domainsToPartition.isEmpty() && domainsToBlock.isEmpty() && domainsToNeitherPartitionNorBlock.isEmpty() && shouldClearFirst == ShouldClearFirst::No) {
>+        completionHandler();
>+        return;
>+    }
>+
>+    if (shouldClearFirst == ShouldClearFirst::Yes)
>+        resetCookiePartitioningState();
>+    else {
>+        for (auto& domain : domainsToNeitherPartitionNorBlock) {
>+            auto& statistic = ensureResourceStatisticsForPrimaryDomain(domain);
>+            statistic.isMarkedForCookiePartitioning = false;
>+            statistic.isMarkedForCookieBlocking = false;
>+        }
>+    }
>+
>+    for (auto& domain : domainsToPartition)
>+        ensureResourceStatisticsForPrimaryDomain(domain).isMarkedForCookiePartitioning = true;
>+
>+    for (auto& domain : domainsToBlock)
>+        ensureResourceStatisticsForPrimaryDomain(domain).isMarkedForCookieBlocking = true;
>+
>+    RunLoop::main().dispatch([store = makeRef(m_store), shouldClearFirst, domainsToPartition = crossThreadCopy(domainsToPartition), domainsToBlock = crossThreadCopy(domainsToBlock), domainsToNeitherPartitionNorBlock = crossThreadCopy(domainsToNeitherPartitionNorBlock), completionHandler = WTFMove(completionHandler)] () mutable {
>+        store->callUpdatePrevalentDomainsToPartitionOrBlockCookiesHandler(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, shouldClearFirst, [store = store.copyRef(), completionHandler = WTFMove(completionHandler)]() mutable {
>+            store->statisticsQueue().dispatch([completionHandler = WTFMove(completionHandler)]() mutable {
>+                completionHandler();
>+            });
>+        });
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::clearPartitioningStateForDomains(const Vector<String>& domains, CompletionHandler<void()>&& completionHandler)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (domains.isEmpty()) {
>+        completionHandler();
>+        return;
>+    }
>+
>+    RunLoop::main().dispatch([store = makeRef(m_store), domains = crossThreadCopy(domains)] {
>+        store->callRemoveDomainsHandler(domains);
>+    });
>+
>+    for (auto& domain : domains) {
>+        auto& statistic = ensureResourceStatisticsForPrimaryDomain(domain);
>+        statistic.isMarkedForCookiePartitioning = false;
>+        statistic.isMarkedForCookieBlocking = false;
>+    }
>+
>+    completionHandler();
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::resetCookiePartitioningState()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>+        resourceStatistic.isMarkedForCookiePartitioning = false;
>+        resourceStatistic.isMarkedForCookieBlocking = false;
>+    }
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::processStatistics(const Function<void(const ResourceLoadStatistics&)>& processFunction) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    for (auto& resourceStatistic : m_resourceStatisticsMap.values())
>+        processFunction(resourceStatistic);
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::hasHadUnexpiredRecentUserInteraction(ResourceLoadStatistics& resourceStatistic) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (resourceStatistic.hadUserInteraction && hasStatisticsExpired(resourceStatistic)) {
>+        // Drop privacy sensitive data because we no longer need it.
>+        // Set timestamp to 0 so that statistics merge will know
>+        // it has been reset as opposed to its default -1.
>+        resourceStatistic.mostRecentUserInteractionTime = { };
>+        resourceStatistic.storageAccessUnderTopFrameOrigins.clear();
>+        resourceStatistic.hadUserInteraction = false;
>+    }
>+
>+    return resourceStatistic.hadUserInteraction;
>+}
>+
>+Vector<String> ResourceLoadStatisticsMemoryStore::topPrivatelyControlledDomainsToRemoveWebsiteDataFor()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    bool shouldCheckForGrandfathering = m_endOfGrandfatheringTimestamp > WallTime::now();
>+    bool shouldClearGrandfathering = !shouldCheckForGrandfathering && m_endOfGrandfatheringTimestamp;
>+
>+    if (shouldClearGrandfathering)
>+        m_endOfGrandfatheringTimestamp = { };
>+
>+    Vector<String> prevalentResources;
>+    for (auto& statistic : m_resourceStatisticsMap.values()) {
>+        if (statistic.isPrevalentResource && !hasHadUnexpiredRecentUserInteraction(statistic) && (!shouldCheckForGrandfathering || !statistic.grandfathered))
>+            prevalentResources.append(statistic.highLevelDomain);
>+
>+        if (shouldClearGrandfathering && statistic.grandfathered)
>+            statistic.grandfathered = false;
>+    }
>+
>+    return prevalentResources;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::includeTodayAsOperatingDateIfNecessary()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto today = OperatingDate::today();
>+    if (!m_operatingDates.isEmpty() && today <= m_operatingDates.last())
>+        return;
>+
>+    while (m_operatingDates.size() >= operatingDatesWindow)
>+        m_operatingDates.remove(0);
>+
>+    m_operatingDates.append(today);
>+}
>+
>+bool ResourceLoadStatisticsMemoryStore::hasStatisticsExpired(const ResourceLoadStatistics& resourceStatistic) const
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (m_operatingDates.size() >= operatingDatesWindow) {
>+        if (OperatingDate::fromWallTime(resourceStatistic.mostRecentUserInteractionTime) < m_operatingDates.first())
>+            return true;
>+    }
>+
>+    // If we don't meet the real criteria for an expired statistic, check the user setting for a tighter restriction (mainly for testing).
>+    if (m_parameters.timeToLiveUserInteraction) {
>+        if (WallTime::now() > resourceStatistic.mostRecentUserInteractionTime + m_parameters.timeToLiveUserInteraction.value())
>+            return true;
>+    }
>+
>+    return false;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setMaxStatisticsEntries(size_t maximumEntryCount)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_parameters.maxStatisticsEntries = maximumEntryCount;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setPruneEntriesDownTo(size_t pruneTargetCount)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_parameters.pruneEntriesDownTo = pruneTargetCount;
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::pruneStatisticsIfNeeded()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    if (m_resourceStatisticsMap.size() <= m_parameters.maxStatisticsEntries)
>+        return;
>+
>+    ASSERT(m_parameters.pruneEntriesDownTo <= m_parameters.maxStatisticsEntries);
>+
>+    size_t numberOfEntriesLeftToPrune = m_resourceStatisticsMap.size() - m_parameters.pruneEntriesDownTo;
>+    ASSERT(numberOfEntriesLeftToPrune);
>+
>+    Vector<StatisticsLastSeen> resourcesToPrunePerImportance[maxImportance + 1];
>+    for (auto& resourceStatistic : m_resourceStatisticsMap.values())
>+        resourcesToPrunePerImportance[computeImportance(resourceStatistic)].append({ resourceStatistic.highLevelDomain, resourceStatistic.lastSeen });
>+
>+    for (unsigned importance = 0; numberOfEntriesLeftToPrune && importance <= maxImportance; ++importance)
>+        pruneResources(m_resourceStatisticsMap, resourcesToPrunePerImportance[importance], numberOfEntriesLeftToPrune);
>+
>+    ASSERT(!numberOfEntriesLeftToPrune);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::resetParametersToDefaultValues()
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    m_parameters = { };
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::logTestingEvent(const String& event)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    RunLoop::main().dispatch([store = makeRef(m_store), event = event.isolatedCopy()] {
>+        store->logTestingEvent(event);
>+    });
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setLastSeen(const String& primaryDomain, Seconds seconds)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    statistics.lastSeen = WallTime::fromRawSeconds(seconds.seconds());
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setPrevalentResource(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& resourceStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::setVeryPrevalentResource(const String& primaryDomain)
>+{
>+    ASSERT(!RunLoop::isMain());
>+
>+    auto& resourceStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>+    setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::VeryHigh);
>+}
>+
>+void ResourceLoadStatisticsMemoryStore::removeAllStorageAccess()
>+{
>+    ASSERT(!RunLoop::isMain());
>+    RunLoop::main().dispatch([store = makeRef(m_store)] () {
>+        store->removeAllStorageAccess();
>+    });
>+}
>+
>+} // namespace WebKit
>diff --git a/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.h b/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.h
>new file mode 100644
>index 0000000000000000000000000000000000000000..4a08b7b56b31534c545c837ea70e7d78b36975c4
>--- /dev/null
>+++ b/Source/WebKit/UIProcess/ResourceLoadStatisticsMemoryStore.h
>@@ -0,0 +1,192 @@
>+/*
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>+ *
>+ * Redistribution and use in source and binary forms, with or without
>+ * modification, are permitted provided that the following conditions
>+ * are met:
>+ * 1. Redistributions of source code must retain the above copyright
>+ *    notice, this list of conditions and the following disclaimer.
>+ * 2. Redistributions in binary form must reproduce the above copyright
>+ *    notice, this list of conditions and the following disclaimer in the
>+ *    documentation and/or other materials provided with the distribution.
>+ *
>+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
>+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
>+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
>+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
>+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
>+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
>+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
>+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
>+ * THE POSSIBILITY OF SUCH DAMAGE.
>+ */
>+
>+#pragma once
>+
>+#include "ResourceLoadStatisticsClassifier.h"
>+#include "WebResourceLoadStatisticsStore.h"
>+#include <wtf/CompletionHandler.h>
>+#include <wtf/Vector.h>
>+#include <wtf/WeakPtr.h>
>+#include <wtf/WorkQueue.h>
>+
>+#if HAVE(CORE_PREDICTION)
>+#include "ResourceLoadStatisticsClassifierCocoa.h"
>+#endif
>+
>+namespace WebCore {
>+class KeyedDecoder;
>+class KeyedEncoder;
>+struct ResourceLoadStatistics;
>+}
>+
>+namespace WebKit {
>+
>+class OperatingDate;
>+class ResourceLoadStatisticsPersistentStorage;
>+
>+// This is always constructed / used / destroyed on the WebResourceLoadStatisticsStore's statistics queue.
>+class ResourceLoadStatisticsMemoryStore : public CanMakeWeakPtr<ResourceLoadStatisticsMemoryStore> {
>+public:
>+    ResourceLoadStatisticsMemoryStore(WebResourceLoadStatisticsStore&, WorkQueue&);
>+    ~ResourceLoadStatisticsMemoryStore();
>+
>+    void setPersistentStorage(ResourceLoadStatisticsPersistentStorage&);
>+
>+    void clear();
>+    bool isEmpty() const { return m_resourceStatisticsMap.isEmpty(); }
>+
>+    std::unique_ptr<WebCore::KeyedEncoder> createEncoderFromData() const;
>+    void mergeWithDataFromDecoder(WebCore::KeyedDecoder&);
>+
>+    void mergeStatistics(Vector<WebCore::ResourceLoadStatistics>&&);
>+    void processStatistics(const Function<void(const WebCore::ResourceLoadStatistics&)>&) const;
>+
>+    void resetCookiePartitioningState();
>+    void updateCookiePartitioning(CompletionHandler<void()>&&);
>+    void updateCookiePartitioningForDomains(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst, CompletionHandler<void()>&&);
>+    void clearPartitioningStateForDomains(const Vector<String>& domains, CompletionHandler<void()>&&);
>+
>+    void includeTodayAsOperatingDateIfNecessary();
>+    void processStatisticsAndDataRecords();
>+
>+    void requestStorageAccessUnderOpener(String&& primaryDomainInNeedOfStorageAccess, uint64_t openerPageID, String&& openerPrimaryDomain, bool isTriggeredByUserGesture);
>+    void removeAllStorageAccess();
>+
>+    void grandfatherExistingWebsiteData(CompletionHandler<void()>&&);
>+    void cancelPendingStatisticsProcessingRequest();
>+
>+    bool isRegisteredAsSubFrameUnder(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain) const;
>+    bool isRegisteredAsRedirectingTo(const String& hostRedirectedFromPrimaryDomain, const String& hostRedirectedToPrimaryDomain) const;
>+
>+    void clearPrevalentResource(const String& primaryDomain);
>+    bool isPrevalentResource(const String& primaryDomain) const;
>+    bool isVeryPrevalentResource(const String& primaryDomain) const;
>+    void setPrevalentResource(const String& primaryDomain);
>+    void setVeryPrevalentResource(const String& primaryDomain);
>+
>+    void setGrandfathered(const String& primaryDomain, bool value);
>+    bool isGrandfathered(const String& primaryDomain) const;
>+
>+    void setSubframeUnderTopFrameOrigin(const String& primarySubFrameDomain, const String& primaryTopFrameDomain);
>+    void setSubresourceUnderTopFrameOrigin(const String& primarySubresourceDomain, const String& primaryTopFrameDomain);
>+    void setSubresourceUniqueRedirectTo(const String& primarySubresourceDomain, const String& primaryRedirectDomain);
>+    void setSubresourceUniqueRedirectFrom(const String& primarySubresourceDomain, const String& primaryRedirectDomain);
>+    void setTopFrameUniqueRedirectTo(const String& topFramePrimaryDomain, const String& primaryRedirectDomain);
>+    void setTopFrameUniqueRedirectFrom(const String& topFramePrimaryDomain, const String& primaryRedirectDomain);
>+
>+    void logTestingEvent(const String&);
>+
>+    void setMaxStatisticsEntries(size_t maximumEntryCount);
>+    void setPruneEntriesDownTo(size_t pruneTargetCount);
>+    void resetParametersToDefaultValues();
>+
>+    void calculateAndSubmitTelemetry() const;
>+
>+    void setNotifyPagesWhenDataRecordsWereScanned(bool);
>+    void setShouldClassifyResourcesBeforeDataRecordsRemoval(bool);
>+    void setShouldSubmitTelemetry(bool);
>+    void setTimeToLiveUserInteraction(Seconds);
>+    void setTimeToLiveCookiePartitionFree(Seconds);
>+    void setMinimumTimeBetweenDataRecordsRemoval(Seconds);
>+    void setGrandfatheringTime(Seconds);
>+    void setResourceLoadStatisticsDebugMode(bool);
>+
>+    void hasStorageAccess(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain, uint64_t frameID, uint64_t pageID, CompletionHandler<void(bool)>&&);
>+    void requestStorageAccess(String&& subFramePrimaryDomain, String&& topFramePrimaryDomain, uint64_t frameID, uint64_t pageID, bool promptEnabled, CompletionHandler<void(StorageAccessStatus)>&&);
>+    void grantStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool userWasPromptedNow, CompletionHandler<void(bool)>&&);
>+
>+    void logNonRecentUserInteraction(const String& primaryDomain);
>+    void logFrameNavigation(const String& targetPrimaryDomain, const String& mainFramePrimaryDomain, const String& sourcePrimaryDomain, const String& targetHost, const String& mainFrameHost, bool areTargetAndMainFrameDomainsAssociated, bool areTargetAndSourceDomainsAssociated, bool isRedirect, bool isMainFrame);
>+    void logUserInteraction(const String& primaryDomain);
>+
>+    void clearUserInteraction(const String& primaryDomain);
>+    bool hasHadUserInteraction(const String& primaryDomain);
>+
>+    void setLastSeen(const String& primaryDomain, Seconds);
>+
>+private:
>+    static bool shouldPartitionCookies(const WebCore::ResourceLoadStatistics&);
>+    static bool shouldBlockCookies(const WebCore::ResourceLoadStatistics&);
>+    static bool hasUserGrantedStorageAccessThroughPrompt(const WebCore::ResourceLoadStatistics&, const String& firstPartyPrimaryDomain);
>+    bool hasHadUnexpiredRecentUserInteraction(WebCore::ResourceLoadStatistics&) const;
>+    bool hasStatisticsExpired(const WebCore::ResourceLoadStatistics&) const;
>+    bool wasAccessedAsFirstPartyDueToUserInteraction(const WebCore::ResourceLoadStatistics& current, const WebCore::ResourceLoadStatistics& updated) const;
>+    void setPrevalentResource(WebCore::ResourceLoadStatistics&, ResourceLoadPrevalence);
>+    unsigned recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(const WebCore::ResourceLoadStatistics&, HashSet<String>& domainsThatHaveRedirectedTo, unsigned numberOfRecursiveCalls) const;
>+    void setStorageAccessPromptsEnabled(bool enabled) { m_storageAccessPromptsEnabled  = enabled; }
>+    bool shouldRemoveDataRecords() const;
>+    void setDebugLogggingEnabled(bool enabled) { m_debugLoggingEnabled  = enabled; }
>+    void setDataRecordsBeingRemoved(bool);
>+    void scheduleStatisticsProcessingRequestIfNecessary();
>+    void grantStorageAccessInternal(String&& subFrameHost, String&& topFrameHost, std::optional<uint64_t> frameID, uint64_t pageID, bool userWasPromptedNowOrEarlier, CompletionHandler<void(bool)>&&);
>+    void markAsPrevalentIfHasRedirectedToPrevalent(WebCore::ResourceLoadStatistics&);
>+    void removeDataRecords(CompletionHandler<void()>&&);
>+    void pruneStatisticsIfNeeded();
>+    WebCore::ResourceLoadStatistics& ensureResourceStatisticsForPrimaryDomain(const String&);
>+    Vector<String> topPrivatelyControlledDomainsToRemoveWebsiteDataFor();
>+
>+#if PLATFORM(COCOA)
>+    void registerUserDefaultsIfNeeded();
>+#endif
>+
>+    struct Parameters {
>+        size_t pruneEntriesDownTo { 800 };
>+        size_t maxStatisticsEntries { 1000 };
>+        std::optional<Seconds> timeToLiveUserInteraction;
>+        Seconds timeToLiveCookiePartitionFree { 24_h };
>+        Seconds minimumTimeBetweenDataRecordsRemoval { 1_h };
>+        Seconds grandfatheringTime { 24_h * 7 };
>+        bool shouldNotifyPagesWhenDataRecordsWereScanned { false };
>+        bool shouldClassifyResourcesBeforeDataRecordsRemoval { true };
>+        bool shouldSubmitTelemetry { true };
>+    };
>+
>+    WebResourceLoadStatisticsStore& m_store;
>+    Ref<WorkQueue> m_workQueue;
>+    WeakPtr<ResourceLoadStatisticsPersistentStorage> m_persistentStorage;
>+    HashMap<String, WebCore::ResourceLoadStatistics> m_resourceStatisticsMap;
>+#if HAVE(CORE_PREDICTION)
>+    ResourceLoadStatisticsClassifierCocoa m_resourceLoadStatisticsClassifier;
>+#else
>+    ResourceLoadStatisticsClassifier m_resourceLoadStatisticsClassifier;
>+#endif
>+#if ENABLE(NETSCAPE_PLUGIN_API)
>+    HashSet<uint64_t> m_activePluginTokens;
>+#endif
>+    Parameters m_parameters;
>+    Vector<OperatingDate> m_operatingDates;
>+    WallTime m_endOfGrandfatheringTimestamp;
>+    bool m_debugLoggingEnabled { false };
>+    bool m_debugModeEnabled { false };
>+    bool m_storageAccessPromptsEnabled { false };
>+    bool m_dataRecordsBeingRemoved { false };
>+    MonotonicTime m_lastTimeDataRecordsWereRemoved;
>+
>+    uint64_t m_lastStatisticsProcessingRequestIdentifier { 0 };
>+    std::optional<uint64_t> m_pendingStatisticsProcessingRequestIdentifier;
>+};
>+
>+} // namespace WebKit
>diff --git a/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.cpp b/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.cpp
>index 234468020a2aaf7e459bcd1849245ad86a102330..0dd44b0aab862088f8ff8552cf5de20cfada34c0 100644
>--- a/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.cpp
>+++ b/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.cpp
>@@ -27,6 +27,7 @@
> #include "ResourceLoadStatisticsPersistentStorage.h"
> 
> #include "Logging.h"
>+#include "ResourceLoadStatisticsMemoryStore.h"
> #include "WebResourceLoadStatisticsStore.h"
> #include <WebCore/FileMonitor.h>
> #include <WebCore/FileSystem.h>
>@@ -81,8 +82,9 @@ static std::unique_ptr<KeyedDecoder> createDecoderForFile(const String& path)
>     return KeyedDecoder::decoder(reinterpret_cast<const uint8_t*>(buffer.data()), buffer.size());
> }
> 
>-ResourceLoadStatisticsPersistentStorage::ResourceLoadStatisticsPersistentStorage(WebResourceLoadStatisticsStore& store, const String& storageDirectoryPath, IsReadOnly isReadOnly)
>-    : m_memoryStore(store)
>+ResourceLoadStatisticsPersistentStorage::ResourceLoadStatisticsPersistentStorage(ResourceLoadStatisticsMemoryStore& memoryStore, WorkQueue& workQueue, const String& storageDirectoryPath, IsReadOnly isReadOnly)
>+    : m_memoryStore(memoryStore)
>+    , m_workQueue(workQueue)
>     , m_storageDirectoryPath(storageDirectoryPath)
>     , m_isReadOnly(isReadOnly)
> {
>@@ -124,7 +126,7 @@ void ResourceLoadStatisticsPersistentStorage::startMonitoringDisk()
>     if (resourceLogPath.isEmpty())
>         return;
> 
>-    m_fileMonitor = std::make_unique<FileMonitor>(resourceLogPath, m_memoryStore.statisticsQueue(), [this, weakThis = makeWeakPtr(*this)] (FileMonitor::FileChangeType type) {
>+    m_fileMonitor = std::make_unique<FileMonitor>(resourceLogPath, m_workQueue.copyRef(), [this, weakThis = makeWeakPtr(*this)] (FileMonitor::FileChangeType type) {
>         ASSERT(!RunLoop::isMain());
>         if (!weakThis)
>             return;
>@@ -134,7 +136,7 @@ void ResourceLoadStatisticsPersistentStorage::startMonitoringDisk()
>             refreshMemoryStoreFromDisk();
>             break;
>         case FileMonitor::FileChangeType::Removal:
>-            m_memoryStore.clearInMemory();
>+            m_memoryStore.clear();
>             m_fileMonitor = nullptr;
>             monitorDirectoryForNewStatistics();
>             break;
>@@ -156,7 +158,7 @@ void ResourceLoadStatisticsPersistentStorage::monitorDirectoryForNewStatistics()
>         }
>     }
> 
>-    m_fileMonitor = std::make_unique<FileMonitor>(storagePath, m_memoryStore.statisticsQueue(), [this] (FileMonitor::FileChangeType type) {
>+    m_fileMonitor = std::make_unique<FileMonitor>(storagePath, m_workQueue.copyRef(), [this] (FileMonitor::FileChangeType type) {
>         ASSERT(!RunLoop::isMain());
>         if (type == FileMonitor::FileChangeType::Removal) {
>             // Directory was removed!
>@@ -286,7 +288,7 @@ void ResourceLoadStatisticsPersistentStorage::scheduleOrWriteMemoryStore(ForceIm
>         if (!m_hasPendingWrite) {
>             m_hasPendingWrite = true;
>             Seconds delay = minimumWriteInterval - timeSinceLastWrite + 1_s;
>-            m_memoryStore.statisticsQueue().dispatchAfter(delay, [weakThis = makeWeakPtr(*this)] {
>+            m_workQueue->dispatchAfter(delay, [weakThis = makeWeakPtr(*this)] {
>                 if (weakThis)
>                     weakThis->writeMemoryStoreToDisk();
>             });
>diff --git a/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.h b/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.h
>index b58de8771b7d5f496b42504420c627665c7602e1..05ea99347b7e3a0b6767bea3fc7b1b7fd040d533 100644
>--- a/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.h
>+++ b/Source/WebKit/UIProcess/ResourceLoadStatisticsPersistentStorage.h
>@@ -30,6 +30,7 @@
> #include <wtf/RunLoop.h>
> #include <wtf/WallTime.h>
> #include <wtf/WeakPtr.h>
>+#include <wtf/WorkQueue.h>
> #include <wtf/text/WTFString.h>
> 
> namespace WebCore {
>@@ -38,13 +39,13 @@ class FileMonitor;
> 
> namespace WebKit {
> 
>-class WebResourceLoadStatisticsStore;
>+class ResourceLoadStatisticsMemoryStore;
> 
> // Can only be constructed / destroyed / used from the WebResourceLoadStatisticsStore's statistic queue.
> class ResourceLoadStatisticsPersistentStorage : public CanMakeWeakPtr<ResourceLoadStatisticsPersistentStorage> {
> public:
>     enum class IsReadOnly { No, Yes };
>-    ResourceLoadStatisticsPersistentStorage(WebResourceLoadStatisticsStore&, const String& storageDirectoryPath, IsReadOnly);
>+    ResourceLoadStatisticsPersistentStorage(ResourceLoadStatisticsMemoryStore&, WorkQueue&, const String& storageDirectoryPath, IsReadOnly);
>     ~ResourceLoadStatisticsPersistentStorage();
> 
>     void clear();
>@@ -65,7 +66,8 @@ private:
>     void excludeFromBackup() const;
>     void refreshMemoryStoreFromDisk();
> 
>-    WebResourceLoadStatisticsStore& m_memoryStore;
>+    ResourceLoadStatisticsMemoryStore& m_memoryStore;
>+    Ref<WorkQueue> m_workQueue;
>     const String m_storageDirectoryPath;
>     std::unique_ptr<WebCore::FileMonitor> m_fileMonitor;
>     WallTime m_lastStatisticsFileSyncTime;
>diff --git a/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.cpp b/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.cpp
>index b08c2814a2b75176ee8249d8e4a26ab6ec3029ad..09d8b6f87532138778e45ee6e398e20159fa1723 100644
>--- a/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.cpp
>+++ b/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.cpp
>@@ -27,8 +27,8 @@
> #include "WebResourceLoadStatisticsStore.h"
> 
> #include "Logging.h"
>-#include "PluginProcessManager.h"
>-#include "PluginProcessProxy.h"
>+#include "ResourceLoadStatisticsMemoryStore.h"
>+#include "ResourceLoadStatisticsPersistentStorage.h"
> #include "WebFrameProxy.h"
> #include "WebPageProxy.h"
> #include "WebProcessMessages.h"
>@@ -37,26 +37,14 @@
> #include "WebResourceLoadStatisticsTelemetry.h"
> #include "WebsiteDataFetchOption.h"
> #include "WebsiteDataStore.h"
>-#include <WebCore/KeyedCoding.h>
> #include <WebCore/ResourceLoadStatistics.h>
> #include <wtf/CrossThreadCopier.h>
>-#include <wtf/DateMath.h>
>-#include <wtf/MathExtras.h>
> #include <wtf/NeverDestroyed.h>
>-#if !RELEASE_LOG_DISABLED
>-#include <wtf/text/StringBuilder.h>
>-#endif
> #include <wtf/threads/BinarySemaphore.h>
> 
> namespace WebKit {
> using namespace WebCore;
> 
>-constexpr unsigned operatingDatesWindow { 30 };
>-constexpr unsigned statisticsModelVersion { 12 };
>-constexpr unsigned maxImportance { 3 };
>-constexpr unsigned maxNumberOfRecursiveCallsInRedirectTraceBack { 50 };
>-constexpr Seconds minimumStatisticsProcessingInterval { 5_s };
>-
> template<typename T> static inline String isolatedPrimaryDomain(const T& value)
> {
>     return ResourceLoadStatistics::primaryDomain(value).isolatedCopy();
>@@ -93,75 +81,34 @@ const OptionSet<WebsiteDataType>& WebResourceLoadStatisticsStore::monitoredDataT
>     return dataTypes;
> }
> 
>-class OperatingDate {
>-public:
>-    OperatingDate() = default;
>-
>-    static OperatingDate fromWallTime(WallTime time)
>-    {
>-        double ms = time.secondsSinceEpoch().milliseconds();
>-        int year = msToYear(ms);
>-        int yearDay = dayInYear(ms, year);
>-        int month = monthFromDayInYear(yearDay, isLeapYear(year));
>-        int monthDay = dayInMonthFromDayInYear(yearDay, isLeapYear(year));
>-
>-        return OperatingDate { year, month, monthDay };
>-    }
>-
>-    static OperatingDate today()
>-    {
>-        return OperatingDate::fromWallTime(WallTime::now());
>-    }
>-
>-    Seconds secondsSinceEpoch() const
>-    {
>-        return Seconds { dateToDaysFrom1970(m_year, m_month, m_monthDay) * secondsPerDay };
>-    }
>-
>-    bool operator==(const OperatingDate& other) const
>-    {
>-        return m_monthDay == other.m_monthDay && m_month == other.m_month && m_year == other.m_year;
>-    }
>-
>-    bool operator<(const OperatingDate& other) const
>-    {
>-        return secondsSinceEpoch() < other.secondsSinceEpoch();
>-    }
>-
>-    bool operator<=(const OperatingDate& other) const
>-    {
>-        return secondsSinceEpoch() <= other.secondsSinceEpoch();
>-    }
>-
>-private:
>-    OperatingDate(int year, int month, int monthDay)
>-        : m_year(year)
>-        , m_month(month)
>-        , m_monthDay(monthDay)
>-    { }
>+void WebResourceLoadStatisticsStore::setNotifyPagesWhenDataRecordsWereScanned(bool value)
>+{
>+    ASSERT(RunLoop::isMain());
> 
>-    int m_year { 0 };
>-    int m_month { 0 }; // [0, 11].
>-    int m_monthDay { 0 }; // [1, 31].
>-};
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), value] {
>+        if (m_memoryStore)
>+            m_memoryStore->setNotifyPagesWhenDataRecordsWereScanned(value);
>+    });
>+}
> 
>-static Vector<OperatingDate> mergeOperatingDates(const Vector<OperatingDate>& existingDates, Vector<OperatingDate>&& newDates)
>+void WebResourceLoadStatisticsStore::setShouldClassifyResourcesBeforeDataRecordsRemoval(bool value)
> {
>-    if (existingDates.isEmpty())
>-        return WTFMove(newDates);
>-
>-    Vector<OperatingDate> mergedDates(existingDates.size() + newDates.size());
>+    ASSERT(RunLoop::isMain());
> 
>-    // Merge the two sorted vectors of dates.
>-    std::merge(existingDates.begin(), existingDates.end(), newDates.begin(), newDates.end(), mergedDates.begin());
>-    // Remove duplicate dates.
>-    removeRepeatedElements(mergedDates);
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), value] {
>+        if (m_memoryStore)
>+            m_memoryStore->setShouldClassifyResourcesBeforeDataRecordsRemoval(value);
>+    });
>+}
> 
>-    // Drop old dates until the Vector size reaches operatingDatesWindow.
>-    while (mergedDates.size() > operatingDatesWindow)
>-        mergedDates.remove(0);
>+void WebResourceLoadStatisticsStore::setShouldSubmitTelemetry(bool value)
>+{
>+    ASSERT(RunLoop::isMain());
> 
>-    return mergedDates;
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), value] {
>+        if (m_memoryStore)
>+            m_memoryStore->setShouldSubmitTelemetry(value);
>+    });
> }
> 
> WebResourceLoadStatisticsStore::WebResourceLoadStatisticsStore(const String& resourceLoadStatisticsDirectory, Function<void(const String&)>&& testingCallback, bool isEphemeral, UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler&& updatePrevalentDomainsToPartitionOrBlockCookiesHandler, HasStorageAccessForFrameHandler&& hasStorageAccessForFrameHandler, GrantStorageAccessHandler&& grantStorageAccessHandler, RemoveAllStorageAccessHandler&& removeAllStorageAccessHandler, RemovePrevalentDomainsHandler&& removeDomainsHandler)
>@@ -176,18 +123,15 @@ WebResourceLoadStatisticsStore::WebResourceLoadStatisticsStore(const String& res
> {
>     ASSERT(RunLoop::isMain());
> 
>-#if PLATFORM(COCOA)
>-    registerUserDefaultsIfNeeded();
>-#endif
>-
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), isEphemeral, resourceLoadStatisticsDirectory = resourceLoadStatisticsDirectory.isolatedCopy()] {
>-        m_persistentStorage = std::make_unique<ResourceLoadStatisticsPersistentStorage>(*this, resourceLoadStatisticsDirectory, isEphemeral ? ResourceLoadStatisticsPersistentStorage::IsReadOnly::Yes : ResourceLoadStatisticsPersistentStorage::IsReadOnly::No);
>-        includeTodayAsOperatingDateIfNecessary();
>+        m_memoryStore = std::make_unique<ResourceLoadStatisticsMemoryStore>(*this, m_statisticsQueue);
>+        m_persistentStorage = std::make_unique<ResourceLoadStatisticsPersistentStorage>(*m_memoryStore, m_statisticsQueue, resourceLoadStatisticsDirectory, isEphemeral ? ResourceLoadStatisticsPersistentStorage::IsReadOnly::Yes : ResourceLoadStatisticsPersistentStorage::IsReadOnly::No);
>+        m_memoryStore->setPersistentStorage(*m_persistentStorage);
>     });
> 
>     m_statisticsQueue->dispatchAfter(5_s, [this, protectedThis = makeRef(*this)] {
>-        if (m_parameters.shouldSubmitTelemetry)
>-            WebResourceLoadStatisticsTelemetry::calculateAndSubmit(*this);
>+        if (m_memoryStore)
>+            m_memoryStore->calculateAndSubmitTelemetry();
>     });
> 
>     m_dailyTasksTimer.startRepeating(24_h);
>@@ -200,7 +144,9 @@ WebResourceLoadStatisticsStore::~WebResourceLoadStatisticsStore()
> 
> void WebResourceLoadStatisticsStore::flushAndDestroyPersistentStore()
> {
>-    if (!m_persistentStorage)
>+    ASSERT(RunLoop::isMain());
>+
>+    if (!m_persistentStorage && !m_memoryStore)
>         return;
> 
>     // Make sure we destroy the persistent store on the background queue and wait for it to die
>@@ -208,184 +154,48 @@ void WebResourceLoadStatisticsStore::flushAndDestroyPersistentStore()
>     BinarySemaphore semaphore;
>     m_statisticsQueue->dispatch([&semaphore, this] {
>         m_persistentStorage = nullptr;
>+        m_memoryStore = nullptr;
>         semaphore.signal();
>     });
>     semaphore.wait(WallTime::infinity());
> }
> 
>-#if !RELEASE_LOG_DISABLED
>-static void appendWithDelimiter(StringBuilder& builder, const String& domain, bool isFirstItem)
>+void WebResourceLoadStatisticsStore::setResourceLoadStatisticsDebugMode(bool value)
> {
>-    if (!isFirstItem)
>-        builder.appendLiteral(", ");
>-    builder.append(domain);
>-}
>-#endif
>-
>-void WebResourceLoadStatisticsStore::removeDataRecords(CompletionHandler<void()>&& callback)
>-{
>-    ASSERT(!RunLoop::isMain());
>-    
>-    if (!shouldRemoveDataRecords()) {
>-        callback();
>-        return;
>-    }
>-
>-#if ENABLE(NETSCAPE_PLUGIN_API)
>-    m_activePluginTokens.clear();
>-    for (auto plugin : PluginProcessManager::singleton().pluginProcesses())
>-        m_activePluginTokens.add(plugin->pluginProcessToken());
>-#endif
>-
>-    auto prevalentResourceDomains = topPrivatelyControlledDomainsToRemoveWebsiteDataFor();
>-    if (prevalentResourceDomains.isEmpty()) {
>-        callback();
>-        return;
>-    }
>-
>-#if !RELEASE_LOG_DISABLED
>-    if (m_debugLoggingEnabled) {
>-        StringBuilder domainsToRemoveDataRecordsForBuilder;
>-        bool isFirstItem = true;
>-        for (auto& domain : prevalentResourceDomains) {
>-            appendWithDelimiter(domainsToRemoveDataRecordsForBuilder, domain, isFirstItem);
>-            isFirstItem = false;
>-        }
>-        RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to remove data records for %{public}s.", domainsToRemoveDataRecordsForBuilder.toString().utf8().data());
>-    }
>-#endif
>+    ASSERT(RunLoop::isMain());
> 
>-    setDataRecordsBeingRemoved(true);
>-
>-    RunLoop::main().dispatch([prevalentResourceDomains = crossThreadCopy(prevalentResourceDomains), callback = WTFMove(callback), this, protectedThis = makeRef(*this)] () mutable {
>-        WebProcessProxy::deleteWebsiteDataForTopPrivatelyControlledDomainsInAllPersistentDataStores(WebResourceLoadStatisticsStore::monitoredDataTypes(), WTFMove(prevalentResourceDomains), m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned, [callback = WTFMove(callback), this, protectedThis = WTFMove(protectedThis)](const HashSet<String>& domainsWithDeletedWebsiteData) mutable {
>-            m_statisticsQueue->dispatch([topDomains = crossThreadCopy(domainsWithDeletedWebsiteData), callback = WTFMove(callback), this, protectedThis = WTFMove(protectedThis)] () mutable {
>-                for (auto& prevalentResourceDomain : topDomains) {
>-                    auto& statistic = ensureResourceStatisticsForPrimaryDomain(prevalentResourceDomain);
>-                    ++statistic.dataRecordsRemoved;
>-                }
>-                setDataRecordsBeingRemoved(false);
>-                callback();
>-#if !RELEASE_LOG_DISABLED
>-                RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Done removing data records.");
>-#endif
>-            });
>-        });
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), value] {
>+        if (m_memoryStore)
>+            m_memoryStore->setResourceLoadStatisticsDebugMode(value);
>     });
> }
> 
> void WebResourceLoadStatisticsStore::scheduleStatisticsAndDataRecordsProcessing()
> {
>     ASSERT(RunLoop::isMain());
>+
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>-        processStatisticsAndDataRecords();
>+        if (m_memoryStore)
>+            m_memoryStore->processStatisticsAndDataRecords();
>     });
> }
> 
>-
>-unsigned WebResourceLoadStatisticsStore::recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(const WebCore::ResourceLoadStatistics& resourceStatistic, HashSet<String>& domainsThatHaveRedirectedTo, unsigned numberOfRecursiveCalls)
>-{
>-    if (numberOfRecursiveCalls >= maxNumberOfRecursiveCallsInRedirectTraceBack) {
>-        ASSERT_NOT_REACHED();
>-        WTFLogAlways("Hit %u recursive calls in redirect backtrace. Returning early.", maxNumberOfRecursiveCallsInRedirectTraceBack);
>-        return numberOfRecursiveCalls;
>-    }
>-
>-    numberOfRecursiveCalls++;
>-    
>-    for (auto& subresourceUniqueRedirectFromDomain : resourceStatistic.subresourceUniqueRedirectsFrom.values()) {
>-        auto mapEntry = m_resourceStatisticsMap.find(subresourceUniqueRedirectFromDomain);
>-        if (mapEntry == m_resourceStatisticsMap.end() || mapEntry->value.isPrevalentResource)
>-            continue;
>-        if (domainsThatHaveRedirectedTo.add(mapEntry->value.highLevelDomain).isNewEntry)
>-            numberOfRecursiveCalls = recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(mapEntry->value, domainsThatHaveRedirectedTo, numberOfRecursiveCalls);
>-    }
>-    for (auto& topFrameUniqueRedirectFromDomain : resourceStatistic.topFrameUniqueRedirectsFrom.values()) {
>-        auto mapEntry = m_resourceStatisticsMap.find(topFrameUniqueRedirectFromDomain);
>-        if (mapEntry == m_resourceStatisticsMap.end() || mapEntry->value.isPrevalentResource)
>-            continue;
>-        if (domainsThatHaveRedirectedTo.add(mapEntry->value.highLevelDomain).isNewEntry)
>-            numberOfRecursiveCalls = recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(mapEntry->value, domainsThatHaveRedirectedTo, numberOfRecursiveCalls);
>-    }
>-    
>-    return numberOfRecursiveCalls;
>-}
>-
>-void WebResourceLoadStatisticsStore::markAsPrevalentIfHasRedirectedToPrevalent(WebCore::ResourceLoadStatistics& resourceStatistic)
>+// On background queue due to IPC.
>+void WebResourceLoadStatisticsStore::resourceLoadStatisticsUpdated(Vector<WebCore::ResourceLoadStatistics>&& origins)
> {
>     ASSERT(!RunLoop::isMain());
> 
>-    if (resourceStatistic.isPrevalentResource)
>+    if (!m_memoryStore)
>         return;
>-    
>-    for (auto& subresourceDomainRedirectedTo : resourceStatistic.subresourceUniqueRedirectsTo.values()) {
>-        auto mapEntry = m_resourceStatisticsMap.find(subresourceDomainRedirectedTo);
>-        if (mapEntry != m_resourceStatisticsMap.end() && mapEntry->value.isPrevalentResource) {
>-            setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>-            return;
>-        }
>-    }
>-
>-    for (auto& topFrameDomainRedirectedTo : resourceStatistic.topFrameUniqueRedirectsTo.values()) {
>-        auto mapEntry = m_resourceStatisticsMap.find(topFrameDomainRedirectedTo);
>-        if (mapEntry != m_resourceStatisticsMap.end() && mapEntry->value.isPrevalentResource) {
>-            setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>-            return;
>-        }
>-    }
>-}
>-
>-void WebResourceLoadStatisticsStore::processStatisticsAndDataRecords()
>-{
>-    ASSERT(!RunLoop::isMain());
> 
>-    if (m_parameters.shouldClassifyResourcesBeforeDataRecordsRemoval) {
>-        for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>-            if (!resourceStatistic.isVeryPrevalentResource) {
>-                markAsPrevalentIfHasRedirectedToPrevalent(resourceStatistic);
>-                auto currentPrevalence = resourceStatistic.isPrevalentResource ? ResourceLoadPrevalence::High : ResourceLoadPrevalence::Low;
>-                auto newPrevalence = m_resourceLoadStatisticsClassifier.calculateResourcePrevalence(resourceStatistic, currentPrevalence);
>-                if (newPrevalence != currentPrevalence)
>-                    setPrevalentResource(resourceStatistic, newPrevalence);
>-            }
>-        }
>-    }
>-    
>-    if (m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned) {
>-        removeDataRecords([this, protectedThis = makeRef(*this)] {
>-            ASSERT(!RunLoop::isMain());
>-
>-            pruneStatisticsIfNeeded();
>-            if (m_persistentStorage)
>-                m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::No);
>-
>-            RunLoop::main().dispatch([] {
>-                WebProcessProxy::notifyPageStatisticsAndDataRecordsProcessed();
>-            });
>-        });
>-    } else {
>-        removeDataRecords([this, protectedThis = makeRef(*this)] {
>-            ASSERT(!RunLoop::isMain());
>-
>-            pruneStatisticsIfNeeded();
>-            if (m_persistentStorage)
>-                m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::No);
>-        });
>-    }
>-}
>-
>-void WebResourceLoadStatisticsStore::resourceLoadStatisticsUpdated(Vector<WebCore::ResourceLoadStatistics>&& origins)
>-{
>-    ASSERT(!RunLoop::isMain());
>-
>-    mergeStatistics(WTFMove(origins));
>+    m_memoryStore->mergeStatistics(WTFMove(origins));
> 
>     // We can cancel any pending request to process statistics since we're doing it synchronously below.
>-    cancelPendingStatisticsProcessingRequest();
>+    m_memoryStore->cancelPendingStatisticsProcessingRequest();
> 
>     // Fire before processing statistics to propagate user interaction as fast as possible to the network process.
>-    updateCookiePartitioning([]() { });
>-    processStatisticsAndDataRecords();
>+    m_memoryStore->updateCookiePartitioning([]() { });
>+    m_memoryStore->processStatisticsAndDataRecords();
> }
> 
> void WebResourceLoadStatisticsStore::hasStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, CompletionHandler<void (bool)>&& completionHandler)
>@@ -394,30 +204,27 @@ void WebResourceLoadStatisticsStore::hasStorageAccess(String&& subFrameHost, Str
>     ASSERT(RunLoop::isMain());
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), subFramePrimaryDomain = isolatedPrimaryDomain(subFrameHost), topFramePrimaryDomain = isolatedPrimaryDomain(topFrameHost), frameID, pageID, completionHandler = WTFMove(completionHandler)] () mutable {
>-        
>-        auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>-        if (shouldBlockCookies(subFrameStatistic)) {
>+        if (!m_memoryStore) {
>             RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>                 completionHandler(false);
>             });
>             return;
>         }
>-
>-        if (!shouldPartitionCookies(subFrameStatistic)) {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>-                completionHandler(true);
>-            });
>-            return;
>-        }
>-
>-        m_hasStorageAccessForFrameHandler(subFramePrimaryDomain, topFramePrimaryDomain, frameID, pageID, [completionHandler = WTFMove(completionHandler)] (bool value) mutable {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), value] () mutable {
>-                completionHandler(value);
>+        m_memoryStore->hasStorageAccess(subFramePrimaryDomain, topFramePrimaryDomain, frameID, pageID, [completionHandler = WTFMove(completionHandler)](bool hasStorageAccess) mutable {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), hasStorageAccess] {
>+                completionHandler(hasStorageAccess);
>             });
>         });
>     });
> }
> 
>+void WebResourceLoadStatisticsStore::callHasStorageAccessForFrameHandler(const String& resourceDomain, const String& firstPartyDomain, uint64_t frameID, uint64_t pageID, Function<void(bool hasAccess)>&& callback)
>+{
>+    ASSERT(RunLoop::isMain());
>+
>+    m_hasStorageAccessForFrameHandler(resourceDomain, firstPartyDomain, frameID, pageID, WTFMove(callback));
>+}
>+
> void WebResourceLoadStatisticsStore::requestStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool promptEnabled, CompletionHandler<void(StorageAccessStatus)>&& completionHandler)
> {
>     ASSERT(subFrameHost != topFrameHost);
>@@ -431,133 +238,60 @@ void WebResourceLoadStatisticsStore::requestStorageAccess(String&& subFrameHost,
>     }
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), subFramePrimaryDomain = crossThreadCopy(subFramePrimaryDomain), topFramePrimaryDomain = crossThreadCopy(topFramePrimaryDomain), frameID, pageID, promptEnabled, completionHandler = WTFMove(completionHandler)] () mutable {
>-
>-        auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>-        if (shouldBlockCookies(subFrameStatistic)) {
>+        if (!m_memoryStore) {
>             RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>                 completionHandler(StorageAccessStatus::CannotRequestAccess);
>             });
>             return;
>         }
>-        
>-        if (!shouldPartitionCookies(subFrameStatistic)) {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>-                completionHandler(StorageAccessStatus::HasAccess);
>-            });
>-            return;
>-        }
> 
>-        auto userWasPromptedEarlier = promptEnabled && hasUserGrantedStorageAccessThroughPrompt(subFrameStatistic, topFramePrimaryDomain);
>-        if (promptEnabled && !userWasPromptedEarlier) {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>-                completionHandler(StorageAccessStatus::RequiresUserPrompt);
>-            });
>-            return;
>-        }
>-
>-        subFrameStatistic.timesAccessedAsFirstPartyDueToStorageAccessAPI++;
>-
>-        grantStorageAccessInternal(WTFMove(subFramePrimaryDomain), WTFMove(topFramePrimaryDomain), frameID, pageID, userWasPromptedEarlier, [completionHandler = WTFMove(completionHandler)] (bool wasGrantedAccess) mutable {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), wasGrantedAccess] () mutable {
>-                completionHandler(wasGrantedAccess ? StorageAccessStatus::HasAccess : StorageAccessStatus::CannotRequestAccess);
>+        m_memoryStore->requestStorageAccess(WTFMove(subFramePrimaryDomain), WTFMove(topFramePrimaryDomain), frameID, pageID, promptEnabled, [completionHandler = WTFMove(completionHandler)](StorageAccessStatus status) mutable {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), status] {
>+                completionHandler(status);
>             });
>         });
>     });
> }
> 
>+// On background queue due to IPC.
> void WebResourceLoadStatisticsStore::requestStorageAccessUnderOpener(String&& primaryDomainInNeedOfStorageAccess, uint64_t openerPageID, String&& openerPrimaryDomain, bool isTriggeredByUserGesture)
> {
>-    ASSERT(primaryDomainInNeedOfStorageAccess != openerPrimaryDomain);
>     ASSERT(!RunLoop::isMain());
>-
>-    if (primaryDomainInNeedOfStorageAccess == openerPrimaryDomain)
>-        return;
>-
>-    auto& domainInNeedOfStorageAccessStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomainInNeedOfStorageAccess);
>-    auto cookiesBlocked = shouldBlockCookies(domainInNeedOfStorageAccessStatistic);
>-
>-    // There are no cookies to get access to if the domain has its cookies blocked and did not get user interaction now.
>-    if (cookiesBlocked && !isTriggeredByUserGesture)
>-        return;
>-
>-    // The domain already has access if its cookies are neither blocked nor partitioned.
>-    if (!cookiesBlocked && !shouldPartitionCookies(domainInNeedOfStorageAccessStatistic))
>-        return;
>-
>-#if !RELEASE_LOG_DISABLED
>-    RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Grant storage access for %{public}s under opener %{public}s, %{public}s user interaction.", primaryDomainInNeedOfStorageAccess.utf8().data(), openerPrimaryDomain.utf8().data(), (isTriggeredByUserGesture ? "with" : "without"));
>-#endif
>-    grantStorageAccessInternal(WTFMove(primaryDomainInNeedOfStorageAccess), WTFMove(openerPrimaryDomain), std::nullopt, openerPageID, false, [](bool) { });
>+    if (m_memoryStore)
>+        m_memoryStore->requestStorageAccessUnderOpener(WTFMove(primaryDomainInNeedOfStorageAccess), openerPageID, WTFMove(openerPrimaryDomain), isTriggeredByUserGesture);
> }
> 
> void WebResourceLoadStatisticsStore::grantStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool userWasPromptedNow, CompletionHandler<void(bool)>&& completionHandler)
> {
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), subFrameHost = crossThreadCopy(subFrameHost), topFrameHost = crossThreadCopy(topFrameHost), frameID, pageID, userWasPromptedNow, completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto subFramePrimaryDomain = isolatedPrimaryDomain(subFrameHost);
>-        auto topFramePrimaryDomain = isolatedPrimaryDomain(topFrameHost);
>-        if (userWasPromptedNow) {
>-            auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>-            ASSERT(subFrameStatistic.hadUserInteraction);
>-            subFrameStatistic.storageAccessUnderTopFrameOrigins.add(topFramePrimaryDomain);
>+        if (!m_memoryStore) {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>+                completionHandler(false);
>+            });
>+            return;
>         }
>-        grantStorageAccessInternal(WTFMove(subFrameHost), WTFMove(topFrameHost), frameID, pageID, userWasPromptedNow, [completionHandler = WTFMove(completionHandler)] (bool wasGrantedAccess) mutable {
>-            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), wasGrantedAccess] () mutable {
>+
>+        m_memoryStore->grantStorageAccess(WTFMove(subFrameHost), WTFMove(topFrameHost), frameID, pageID, userWasPromptedNow, [completionHandler = WTFMove(completionHandler)](bool wasGrantedAccess) mutable {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler), wasGrantedAccess] {
>                 completionHandler(wasGrantedAccess);
>             });
>         });
>     });
> }
> 
>-void WebResourceLoadStatisticsStore::grantStorageAccessInternal(String&& subFramePrimaryDomain, String&& topFramePrimaryDomain, std::optional<uint64_t> frameID, uint64_t pageID, bool userWasPromptedNowOrEarlier, CompletionHandler<void(bool)>&& callback)
>+void WebResourceLoadStatisticsStore::callGrantStorageAccessHandler(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain, std::optional<uint64_t> frameID, uint64_t pageID, CompletionHandler<void(bool)>&& callback)
> {
>-    ASSERT(!RunLoop::isMain());
>-
>-    if (subFramePrimaryDomain == topFramePrimaryDomain) {
>-        callback(true);
>-        return;
>-    }
>-
>-    // FIXME: Remove m_storageAccessPromptsEnabled check if prompting is no longer experimental.
>-    if (userWasPromptedNowOrEarlier && m_storageAccessPromptsEnabled) {
>-        auto& subFrameStatistic = ensureResourceStatisticsForPrimaryDomain(subFramePrimaryDomain);
>-        ASSERT(subFrameStatistic.hadUserInteraction);
>-        ASSERT(subFrameStatistic.storageAccessUnderTopFrameOrigins.contains(topFramePrimaryDomain));
>-        subFrameStatistic.mostRecentUserInteractionTime = WallTime::now();
>-    }
>+    ASSERT(RunLoop::isMain());
> 
>     m_grantStorageAccessHandler(subFramePrimaryDomain, topFramePrimaryDomain, frameID, pageID, WTFMove(callback));
> }
> 
> void WebResourceLoadStatisticsStore::removeAllStorageAccess()
> {
>-    ASSERT(!RunLoop::isMain());
>-    RunLoop::main().dispatch([this, protectedThis = makeRef(*this)] () {
>-        m_removeAllStorageAccessHandler();
>-    });
>-}
>-
>-void WebResourceLoadStatisticsStore::grandfatherExistingWebsiteData(CompletionHandler<void()>&& callback)
>-{
>-    ASSERT(!RunLoop::isMain());
>+    ASSERT(RunLoop::isMain());
> 
>-    RunLoop::main().dispatch([this, protectedThis = makeRef(*this), callback = WTFMove(callback)] () mutable {
>-        // FIXME: This method being a static call on WebProcessProxy is wrong.
>-        // It should be on the data store that this object belongs to.
>-        WebProcessProxy::topPrivatelyControlledDomainsWithWebsiteData(WebResourceLoadStatisticsStore::monitoredDataTypes(), m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned, [this, protectedThis = WTFMove(protectedThis), callback = WTFMove(callback)] (HashSet<String>&& topPrivatelyControlledDomainsWithWebsiteData) mutable {
>-            m_statisticsQueue->dispatch([this, protectedThis = WTFMove(protectedThis), topDomains = crossThreadCopy(topPrivatelyControlledDomainsWithWebsiteData), callback = WTFMove(callback)] () mutable {
>-                for (auto& topPrivatelyControlledDomain : topDomains) {
>-                    auto& statistic = ensureResourceStatisticsForPrimaryDomain(topPrivatelyControlledDomain);
>-                    statistic.grandfathered = true;
>-                }
>-                m_endOfGrandfatheringTimestamp = WallTime::now() + m_parameters.grandfatheringTime;
>-                if (m_persistentStorage)
>-                    m_persistentStorage->scheduleOrWriteMemoryStore(ResourceLoadStatisticsPersistentStorage::ForceImmediateWrite::Yes);
>-                callback();
>-                logTestingEvent("Grandfathered"_s);
>-            });
>-        });
>-    });
>+    m_removeAllStorageAccessHandler();
> }
>     
> void WebResourceLoadStatisticsStore::processWillOpenConnection(WebProcessProxy&, IPC::Connection& connection)
>@@ -580,51 +314,24 @@ void WebResourceLoadStatisticsStore::performDailyTasks()
>     ASSERT(RunLoop::isMain());
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>-        includeTodayAsOperatingDateIfNecessary();
>+        if (!m_memoryStore)
>+            return;
>+
>+        m_memoryStore->includeTodayAsOperatingDateIfNecessary();
>+        m_memoryStore->calculateAndSubmitTelemetry();
>     });
>-    if (m_parameters.shouldSubmitTelemetry)
>-        submitTelemetry();
> }
> 
> void WebResourceLoadStatisticsStore::submitTelemetry()
> {
>     ASSERT(RunLoop::isMain());
>-    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>-        WebResourceLoadStatisticsTelemetry::calculateAndSubmit(*this);
>-    });
>-}
>-
>-void WebResourceLoadStatisticsStore::setResourceLoadStatisticsDebugMode(bool enable)
>-{
>-    m_debugModeEnabled = enable;
>-#if !RELEASE_LOG_DISABLED
>-    RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "ITP Debug Mode %{public}s.", (m_debugModeEnabled ? "enabled" : "disabled"));
>-#endif
>-}
>-
>-void WebResourceLoadStatisticsStore::scheduleStatisticsProcessingRequestIfNecessary()
>-{
>-    ASSERT(!RunLoop::isMain());
>-
>-    m_pendingStatisticsProcessingRequestIdentifier = ++m_lastStatisticsProcessingRequestIdentifier;
>-    m_statisticsQueue->dispatchAfter(minimumStatisticsProcessingInterval, [this, protectedThis = makeRef(*this), statisticsProcessingRequestIdentifier = *m_pendingStatisticsProcessingRequestIdentifier] {
>-        if (!m_pendingStatisticsProcessingRequestIdentifier || *m_pendingStatisticsProcessingRequestIdentifier != statisticsProcessingRequestIdentifier) {
>-            // This request has been canceled.
>-            return;
>-        }
> 
>-        updateCookiePartitioning([]() { });
>-        processStatisticsAndDataRecords();
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>+        if (m_memoryStore)
>+            WebResourceLoadStatisticsTelemetry::calculateAndSubmit(*m_memoryStore);
>     });
> }
> 
>-void WebResourceLoadStatisticsStore::cancelPendingStatisticsProcessingRequest()
>-{
>-    ASSERT(!RunLoop::isMain());
>-
>-    m_pendingStatisticsProcessingRequestIdentifier = std::nullopt;
>-}
>-
> void WebResourceLoadStatisticsStore::logFrameNavigation(const WebFrameProxy& frame, const URL& pageURL, const WebCore::ResourceRequest& request, const WebCore::URL& redirectURL)
> {
>     ASSERT(RunLoop::isMain());
>@@ -657,34 +364,8 @@ void WebResourceLoadStatisticsStore::logFrameNavigation(const WebFrameProxy& fra
>     bool areTargetAndSourceDomainsAssociated = areDomainsAssociated(page, targetPrimaryDomain, sourcePrimaryDomain);
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), targetPrimaryDomain = targetPrimaryDomain.isolatedCopy(), mainFramePrimaryDomain = mainFramePrimaryDomain.isolatedCopy(), sourcePrimaryDomain = sourcePrimaryDomain.isolatedCopy(), targetHost = targetHost.toString().isolatedCopy(), mainFrameHost = mainFrameHost.toString().isolatedCopy(), areTargetAndMainFrameDomainsAssociated, areTargetAndSourceDomainsAssociated, isRedirect, isMainFrame = frame.isMainFrame()] {
>-        bool statisticsWereUpdated = false;
>-        if (targetHost != mainFrameHost && !(areTargetAndMainFrameDomainsAssociated || areTargetAndSourceDomainsAssociated)) {
>-            auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>-            targetStatistics.lastSeen = ResourceLoadStatistics::reduceTimeResolution(WallTime::now());
>-            if (targetStatistics.subframeUnderTopFrameOrigins.add(mainFramePrimaryDomain).isNewEntry)
>-                statisticsWereUpdated = true;
>-        }
>-
>-        if (isRedirect && !areTargetAndSourceDomainsAssociated) {
>-            if (isMainFrame) {
>-                auto& redirectingOriginStatistics = ensureResourceStatisticsForPrimaryDomain(sourcePrimaryDomain);
>-                if (redirectingOriginStatistics.topFrameUniqueRedirectsTo.add(targetPrimaryDomain).isNewEntry)
>-                    statisticsWereUpdated = true;
>-                auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>-                if (targetStatistics.topFrameUniqueRedirectsFrom.add(sourcePrimaryDomain).isNewEntry)
>-                    statisticsWereUpdated = true;
>-            } else {
>-                auto& redirectingOriginStatistics = ensureResourceStatisticsForPrimaryDomain(sourcePrimaryDomain);
>-                if (redirectingOriginStatistics.subresourceUniqueRedirectsTo.add(targetPrimaryDomain).isNewEntry)
>-                    statisticsWereUpdated = true;
>-                auto& targetStatistics = ensureResourceStatisticsForPrimaryDomain(targetPrimaryDomain);
>-                if (targetStatistics.subresourceUniqueRedirectsFrom.add(sourcePrimaryDomain).isNewEntry)
>-                    statisticsWereUpdated = true;
>-            }
>-        }
>-
>-        if (statisticsWereUpdated)
>-            scheduleStatisticsProcessingRequestIfNecessary();
>+        if (m_memoryStore)
>+            m_memoryStore->logFrameNavigation(targetPrimaryDomain, mainFramePrimaryDomain, sourcePrimaryDomain, targetHost, mainFrameHost, areTargetAndMainFrameDomainsAssociated, areTargetAndSourceDomainsAssociated, isRedirect, isMainFrame);
>     });
> }
> 
>@@ -696,12 +377,8 @@ void WebResourceLoadStatisticsStore::logUserInteraction(const URL& url)
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.hadUserInteraction = true;
>-        statistics.mostRecentUserInteractionTime = WallTime::now();
>-
>-        if (statistics.isMarkedForCookieBlocking)
>-            updateCookiePartitioningForDomains({ primaryDomain }, { }, { }, ShouldClearFirst::No, []() { });
>+        if (m_memoryStore)
>+            m_memoryStore->logUserInteraction(primaryDomain);
>     });
> }
> 
>@@ -713,11 +390,8 @@ void WebResourceLoadStatisticsStore::logNonRecentUserInteraction(const URL& url)
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.hadUserInteraction = true;
>-        statistics.mostRecentUserInteractionTime = WallTime::now() - (m_parameters.timeToLiveCookiePartitionFree + Seconds::fromHours(1));
>-
>-        updateCookiePartitioningForDomains({ primaryDomain }, { }, { }, ShouldClearFirst::No, []() { });
>+        if (m_memoryStore)
>+            m_memoryStore->logNonRecentUserInteraction(primaryDomain);
>     });
> }
> 
>@@ -729,9 +403,8 @@ void WebResourceLoadStatisticsStore::clearUserInteraction(const URL& url)
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.hadUserInteraction = false;
>-        statistics.mostRecentUserInteractionTime = { };
>+        if (m_memoryStore)
>+            m_memoryStore->clearUserInteraction(primaryDomain);
>     });
> }
> 
>@@ -745,8 +418,7 @@ void WebResourceLoadStatisticsStore::hasHadUserInteraction(const URL& url, Compl
>     }
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url), completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>-        bool hadUserInteraction = mapEntry == m_resourceStatisticsMap.end() ? false: hasHadUnexpiredRecentUserInteraction(mapEntry->value);
>+        bool hadUserInteraction = m_memoryStore ? m_memoryStore->hasHadUserInteraction(primaryDomain) : false;
>         RunLoop::main().dispatch([hadUserInteraction, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(hadUserInteraction);
>         });
>@@ -761,8 +433,8 @@ void WebResourceLoadStatisticsStore::setLastSeen(const URL& url, Seconds seconds
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url), seconds] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.lastSeen = WallTime::fromRawSeconds(seconds.seconds());
>+        if (m_memoryStore)
>+            m_memoryStore->setLastSeen(primaryDomain, seconds);
>     });
> }
>     
>@@ -774,40 +446,24 @@ void WebResourceLoadStatisticsStore::setPrevalentResource(const URL& url)
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& resourceStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::High);
>+        if (m_memoryStore)
>+            m_memoryStore->setPrevalentResource(primaryDomain);
>     });
> }
> 
> void WebResourceLoadStatisticsStore::setVeryPrevalentResource(const URL& url)
> {
>-    ASSERT(isMainThread());
>+    ASSERT(RunLoop::isMain());
> 
>     if (url.isBlankURL() || url.isEmpty())
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& resourceStatistic = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        setPrevalentResource(resourceStatistic, ResourceLoadPrevalence::VeryHigh);
>+        if (m_memoryStore)
>+            m_memoryStore->setVeryPrevalentResource(primaryDomain);
>     });
> }
> 
>-void WebResourceLoadStatisticsStore::setPrevalentResource(WebCore::ResourceLoadStatistics& resourceStatistic, ResourceLoadPrevalence newPrevalence)
>-{
>-    ASSERT(!RunLoop::isMain());
>-    resourceStatistic.isPrevalentResource = true;
>-    resourceStatistic.isVeryPrevalentResource = newPrevalence == ResourceLoadPrevalence::VeryHigh;
>-    HashSet<String> domainsThatHaveRedirectedTo;
>-    recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(resourceStatistic, domainsThatHaveRedirectedTo, 0);
>-    for (auto& domain : domainsThatHaveRedirectedTo) {
>-        auto mapEntry = m_resourceStatisticsMap.find(domain);
>-        if (mapEntry == m_resourceStatisticsMap.end())
>-            continue;
>-        ASSERT(!mapEntry->value.isPrevalentResource);
>-        mapEntry->value.isPrevalentResource = true;
>-    }
>-}
>-
> void WebResourceLoadStatisticsStore::isPrevalentResource(const URL& url, CompletionHandler<void (bool)>&& completionHandler)
> {
>     ASSERT(RunLoop::isMain());
>@@ -818,8 +474,7 @@ void WebResourceLoadStatisticsStore::isPrevalentResource(const URL& url, Complet
>     }
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url), completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>-        bool isPrevalentResource = mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.isPrevalentResource;
>+        bool isPrevalentResource = m_memoryStore ? m_memoryStore->isPrevalentResource(primaryDomain) : false;
>         RunLoop::main().dispatch([isPrevalentResource, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(isPrevalentResource);
>         });
>@@ -828,7 +483,7 @@ void WebResourceLoadStatisticsStore::isPrevalentResource(const URL& url, Complet
> 
> void WebResourceLoadStatisticsStore::isVeryPrevalentResource(const URL& url, CompletionHandler<void(bool)>&& completionHandler)
> {
>-    ASSERT(isMainThread());
>+    ASSERT(RunLoop::isMain());
> 
>     if (url.isBlankURL() || url.isEmpty()) {
>         completionHandler(false);
>@@ -836,8 +491,7 @@ void WebResourceLoadStatisticsStore::isVeryPrevalentResource(const URL& url, Com
>     }
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url), completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>-        bool isVeryPrevalentResource = mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.isPrevalentResource && mapEntry->value.isVeryPrevalentResource;
>+        bool isVeryPrevalentResource = m_memoryStore ? m_memoryStore->isVeryPrevalentResource(primaryDomain) : false;
>         RunLoop::main().dispatch([isVeryPrevalentResource, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(isVeryPrevalentResource);
>         });
>@@ -849,8 +503,7 @@ void WebResourceLoadStatisticsStore::isRegisteredAsSubFrameUnder(const URL& subF
>     ASSERT(RunLoop::isMain());
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), subFramePrimaryDomain = isolatedPrimaryDomain(subFrame), topFramePrimaryDomain = isolatedPrimaryDomain(topFrame), completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(subFramePrimaryDomain);
>-        bool isRegisteredAsSubFrameUnder = mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.subframeUnderTopFrameOrigins.contains(topFramePrimaryDomain);
>+        bool isRegisteredAsSubFrameUnder = m_memoryStore ? m_memoryStore->isRegisteredAsSubFrameUnder(subFramePrimaryDomain, topFramePrimaryDomain) : false;
>         RunLoop::main().dispatch([isRegisteredAsSubFrameUnder, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(isRegisteredAsSubFrameUnder);
>         });
>@@ -862,8 +515,7 @@ void WebResourceLoadStatisticsStore::isRegisteredAsRedirectingTo(const URL& host
>     ASSERT(RunLoop::isMain());
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), hostRedirectedFromPrimaryDomain = isolatedPrimaryDomain(hostRedirectedFrom), hostRedirectedToPrimaryDomain = isolatedPrimaryDomain(hostRedirectedTo), completionHandler = WTFMove(completionHandler)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(hostRedirectedFromPrimaryDomain);
>-        bool isRegisteredAsRedirectingTo = mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.subresourceUniqueRedirectsTo.contains(hostRedirectedToPrimaryDomain);
>+        bool isRegisteredAsRedirectingTo = m_memoryStore ? m_memoryStore->isRegisteredAsRedirectingTo(hostRedirectedFromPrimaryDomain, hostRedirectedToPrimaryDomain) : false;
>         RunLoop::main().dispatch([isRegisteredAsRedirectingTo, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(isRegisteredAsRedirectingTo);
>         });
>@@ -878,9 +530,8 @@ void WebResourceLoadStatisticsStore::clearPrevalentResource(const URL& url)
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.isPrevalentResource = false;
>-        statistics.isVeryPrevalentResource = false;
>+        if (m_memoryStore)
>+            m_memoryStore->clearPrevalentResource(primaryDomain);
>     });
> }
> 
>@@ -892,8 +543,8 @@ void WebResourceLoadStatisticsStore::setGrandfathered(const URL& url, bool value
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryDomain = isolatedPrimaryDomain(url), value] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primaryDomain);
>-        statistics.grandfathered = value;
>+        if (m_memoryStore)
>+            m_memoryStore->setGrandfathered(primaryDomain, value);
>     });
> }
> 
>@@ -907,8 +558,7 @@ void WebResourceLoadStatisticsStore::isGrandfathered(const URL& url, CompletionH
>     }
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), completionHandler = WTFMove(completionHandler), primaryDomain = isolatedPrimaryDomain(url)] () mutable {
>-        auto mapEntry = m_resourceStatisticsMap.find(primaryDomain);
>-        bool isGrandFathered = mapEntry == m_resourceStatisticsMap.end() ? false : mapEntry->value.grandfathered;
>+        bool isGrandFathered = m_memoryStore ? m_memoryStore->isGrandfathered(primaryDomain) : false;
>         RunLoop::main().dispatch([isGrandFathered, completionHandler = WTFMove(completionHandler)] {
>             completionHandler(isGrandFathered);
>         });
>@@ -923,10 +573,8 @@ void WebResourceLoadStatisticsStore::setSubframeUnderTopFrameOrigin(const URL& s
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryTopFrameDomain = isolatedPrimaryDomain(topFrame), primarySubFrameDomain = isolatedPrimaryDomain(subframe)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubFrameDomain);
>-        statistics.subframeUnderTopFrameOrigins.add(primaryTopFrameDomain);
>-        // For consistency, make sure we also have a statistics entry for the top frame domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryTopFrameDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setSubframeUnderTopFrameOrigin(primarySubFrameDomain, primaryTopFrameDomain);
>     });
> }
> 
>@@ -938,10 +586,8 @@ void WebResourceLoadStatisticsStore::setSubresourceUnderTopFrameOrigin(const URL
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryTopFrameDomain = isolatedPrimaryDomain(topFrame), primarySubresourceDomain = isolatedPrimaryDomain(subresource)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>-        statistics.subresourceUnderTopFrameOrigins.add(primaryTopFrameDomain);
>-        // For consistency, make sure we also have a statistics entry for the top frame domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryTopFrameDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setSubresourceUnderTopFrameOrigin(primarySubresourceDomain, primaryTopFrameDomain);
>     });
> }
> 
>@@ -953,10 +599,8 @@ void WebResourceLoadStatisticsStore::setSubresourceUniqueRedirectTo(const URL& s
>         return;
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryRedirectDomain = isolatedPrimaryDomain(hostNameRedirectedTo), primarySubresourceDomain = isolatedPrimaryDomain(subresource)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>-        statistics.subresourceUniqueRedirectsTo.add(primaryRedirectDomain);
>-        // For consistency, make sure we also have a statistics entry for the redirect domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setSubresourceUniqueRedirectTo(primarySubresourceDomain, primaryRedirectDomain);
>     });
> }
> 
>@@ -968,10 +612,8 @@ void WebResourceLoadStatisticsStore::setSubresourceUniqueRedirectFrom(const URL&
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryRedirectDomain = isolatedPrimaryDomain(hostNameRedirectedFrom), primarySubresourceDomain = isolatedPrimaryDomain(subresource)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(primarySubresourceDomain);
>-        statistics.subresourceUniqueRedirectsFrom.add(primaryRedirectDomain);
>-        // For consistency, make sure we also have a statistics entry for the redirect domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setSubresourceUniqueRedirectFrom(primarySubresourceDomain, primaryRedirectDomain);
>     });
> }
> 
>@@ -983,10 +625,8 @@ void WebResourceLoadStatisticsStore::setTopFrameUniqueRedirectTo(const URL& topF
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryRedirectDomain = isolatedPrimaryDomain(hostNameRedirectedTo), topFramePrimaryDomain = isolatedPrimaryDomain(topFrameHostName)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(topFramePrimaryDomain);
>-        statistics.topFrameUniqueRedirectsTo.add(primaryRedirectDomain);
>-        // For consistency, make sure we also have a statistics entry for the redirect domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setTopFrameUniqueRedirectTo(topFramePrimaryDomain, primaryRedirectDomain);
>     });
> }
> 
>@@ -998,10 +638,8 @@ void WebResourceLoadStatisticsStore::setTopFrameUniqueRedirectFrom(const URL& to
>         return;
>     
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), primaryRedirectDomain = isolatedPrimaryDomain(hostNameRedirectedFrom), topFramePrimaryDomain = isolatedPrimaryDomain(topFrameHostName)] {
>-        auto& statistics = ensureResourceStatisticsForPrimaryDomain(topFramePrimaryDomain);
>-        statistics.topFrameUniqueRedirectsFrom.add(primaryRedirectDomain);
>-        // For consistency, make sure we also have a statistics entry for the redirect domain.
>-        ensureResourceStatisticsForPrimaryDomain(primaryRedirectDomain);
>+        if (m_memoryStore)
>+            m_memoryStore->setTopFrameUniqueRedirectFrom(topFramePrimaryDomain, primaryRedirectDomain);
>     });
> }
> 
>@@ -1011,7 +649,13 @@ void WebResourceLoadStatisticsStore::scheduleCookiePartitioningUpdate(Completion
>     ASSERT(RunLoop::isMain());
> 
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), completionHandler = WTFMove(completionHandler)] () mutable {
>-        updateCookiePartitioning([completionHandler = WTFMove(completionHandler)]() mutable {
>+        if (!m_memoryStore) {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>+                completionHandler();
>+            });
>+            return;
>+        }
>+        m_memoryStore->updateCookiePartitioning([completionHandler = WTFMove(completionHandler)]() mutable {
>             RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>                 completionHandler();
>             });
>@@ -1024,7 +668,14 @@ void WebResourceLoadStatisticsStore::scheduleCookiePartitioningUpdateForDomains(
>     // Helper function used by testing system. Should only be called from the main thread.
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), domainsToPartition = crossThreadCopy(domainsToPartition), domainsToBlock = crossThreadCopy(domainsToBlock), domainsToNeitherPartitionNorBlock = crossThreadCopy(domainsToNeitherPartitionNorBlock), shouldClearFirst, completionHandler = WTFMove(completionHandler)] () mutable {
>-        updateCookiePartitioningForDomains(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, shouldClearFirst, [completionHandler = WTFMove(completionHandler)]() mutable {
>+        if (!m_memoryStore) {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>+                completionHandler();
>+            });
>+            return;
>+        }
>+
>+        m_memoryStore->updateCookiePartitioningForDomains(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, shouldClearFirst, [completionHandler = WTFMove(completionHandler)]() mutable {
>             RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>                 completionHandler();
>             });
>@@ -1037,7 +688,14 @@ void WebResourceLoadStatisticsStore::scheduleClearPartitioningStateForDomains(co
>     // Helper function used by testing system. Should only be called from the main thread.
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), domains = crossThreadCopy(domains), completionHandler = WTFMove(completionHandler)] () mutable {
>-        clearPartitioningStateForDomains(domains, [completionHandler = WTFMove(completionHandler)]() mutable {
>+        if (!m_memoryStore) {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>+                completionHandler();
>+            });
>+            return;
>+        }
>+
>+        m_memoryStore->clearPartitioningStateForDomains(domains, [completionHandler = WTFMove(completionHandler)]() mutable {
>             RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)]() {
>                 completionHandler();
>             });
>@@ -1050,7 +708,8 @@ void WebResourceLoadStatisticsStore::scheduleCookiePartitioningStateReset()
> {
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>-        resetCookiePartitioningState();
>+        if (m_memoryStore)
>+            m_memoryStore->resetCookiePartitioningState();
>     });
> }
> #endif
>@@ -1059,7 +718,8 @@ void WebResourceLoadStatisticsStore::scheduleClearInMemory()
> {
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this)] {
>-        clearInMemory();
>+        if (m_memoryStore)
>+            m_memoryStore->clear();
>     });
> }
> 
>@@ -1067,20 +727,28 @@ void WebResourceLoadStatisticsStore::scheduleClearInMemoryAndPersistent(ShouldGr
> {
>     ASSERT(RunLoop::isMain());
>     m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), shouldGrandfather, completionHandler = WTFMove(completionHandler)] () mutable {
>-        clearInMemory();
>+        if (m_memoryStore)
>+            m_memoryStore->clear();
>         if (m_persistentStorage)
>             m_persistentStorage->clear();
>         
>-        if (shouldGrandfather == ShouldGrandfather::Yes)
>-            grandfatherExistingWebsiteData(WTFMove(completionHandler));
>-        else {
>-            completionHandler();
>-        }
>+        CompletionHandler<void()> callCompletionHandlerOnMainThread = [completionHandler = WTFMove(completionHandler)]() mutable {
>+            RunLoop::main().dispatch([completionHandler = WTFMove(completionHandler)] {
>+                completionHandler();
>+            });
>+        };
>+
>+        if (shouldGrandfather == ShouldGrandfather::Yes && m_memoryStore)
>+            m_memoryStore->grandfatherExistingWebsiteData(WTFMove(callCompletionHandlerOnMainThread));
>+        else
>+            callCompletionHandlerOnMainThread();
>     });
> }
> 
> void WebResourceLoadStatisticsStore::scheduleClearInMemoryAndPersistent(WallTime modifiedSince, ShouldGrandfather shouldGrandfather, CompletionHandler<void()>&& callback)
> {
>+    ASSERT(RunLoop::isMain());
>+
>     // For now, be conservative and clear everything regardless of modifiedSince.
>     UNUSED_PARAM(modifiedSince);
>     scheduleClearInMemoryAndPersistent(shouldGrandfather, WTFMove(callback));
>@@ -1088,462 +756,88 @@ void WebResourceLoadStatisticsStore::scheduleClearInMemoryAndPersistent(WallTime
> 
> void WebResourceLoadStatisticsStore::setTimeToLiveUserInteraction(Seconds seconds)
> {
>-    ASSERT(seconds >= 0_s);
>-    m_parameters.timeToLiveUserInteraction = seconds;
>-}
>-
>-void WebResourceLoadStatisticsStore::setTimeToLiveCookiePartitionFree(Seconds seconds)
>-{
>-    ASSERT(seconds >= 0_s);
>-    m_parameters.timeToLiveCookiePartitionFree = seconds;
>-}
>-
>-void WebResourceLoadStatisticsStore::setMinimumTimeBetweenDataRecordsRemoval(Seconds seconds)
>-{
>-    ASSERT(seconds >= 0_s);
>-    m_parameters.minimumTimeBetweenDataRecordsRemoval = seconds;
>-}
>-
>-void WebResourceLoadStatisticsStore::setGrandfatheringTime(Seconds seconds)
>-{
>-    ASSERT(seconds >= 0_s);
>-    m_parameters.grandfatheringTime = seconds;
>-}
>-
>-bool WebResourceLoadStatisticsStore::shouldRemoveDataRecords() const
>-{
>-    ASSERT(!RunLoop::isMain());
>-    if (m_dataRecordsBeingRemoved)
>-        return false;
>-
>-#if ENABLE(NETSCAPE_PLUGIN_API)
>-    for (auto plugin : PluginProcessManager::singleton().pluginProcesses()) {
>-        if (!m_activePluginTokens.contains(plugin->pluginProcessToken()))
>-            return true;
>-    }
>-#endif
>-
>-    return !m_lastTimeDataRecordsWereRemoved || MonotonicTime::now() >= (m_lastTimeDataRecordsWereRemoved + m_parameters.minimumTimeBetweenDataRecordsRemoval);
>-}
>-
>-void WebResourceLoadStatisticsStore::setDataRecordsBeingRemoved(bool value)
>-{
>-    ASSERT(!RunLoop::isMain());
>-    m_dataRecordsBeingRemoved = value;
>-    if (m_dataRecordsBeingRemoved)
>-        m_lastTimeDataRecordsWereRemoved = MonotonicTime::now();
>-}
>-
>-ResourceLoadStatistics& WebResourceLoadStatisticsStore::ensureResourceStatisticsForPrimaryDomain(const String& primaryDomain)
>-{
>-    ASSERT(!RunLoop::isMain());
>-    return m_resourceStatisticsMap.ensure(primaryDomain, [&primaryDomain] {
>-        return ResourceLoadStatistics(primaryDomain);
>-    }).iterator->value;
>-}
>-
>-std::unique_ptr<KeyedEncoder> WebResourceLoadStatisticsStore::createEncoderFromData() const
>-{
>-    ASSERT(!RunLoop::isMain());
>-    auto encoder = KeyedEncoder::encoder();
>-    encoder->encodeUInt32("version", statisticsModelVersion);
>-    encoder->encodeDouble("endOfGrandfatheringTimestamp", m_endOfGrandfatheringTimestamp.secondsSinceEpoch().value());
>-
>-    encoder->encodeObjects("browsingStatistics", m_resourceStatisticsMap.begin(), m_resourceStatisticsMap.end(), [](KeyedEncoder& encoderInner, const auto& origin) {
>-        origin.value.encode(encoderInner);
>-    });
>-
>-    encoder->encodeObjects("operatingDates", m_operatingDates.begin(), m_operatingDates.end(), [](KeyedEncoder& encoderInner, OperatingDate date) {
>-        encoderInner.encodeDouble("date", date.secondsSinceEpoch().value());
>-    });
>-
>-    return encoder;
>-}
>-
>-void WebResourceLoadStatisticsStore::mergeWithDataFromDecoder(KeyedDecoder& decoder)
>-{
>-    ASSERT(!RunLoop::isMain());
>-
>-    unsigned versionOnDisk;
>-    if (!decoder.decodeUInt32("version", versionOnDisk))
>-        return;
>-
>-    if (versionOnDisk > statisticsModelVersion) {
>-        WTFLogAlways("Found resource load statistics on disk with model version %u whereas the highest supported version is %u. Resetting.", versionOnDisk, statisticsModelVersion);
>-        return;
>-    }
>-
>-    double endOfGrandfatheringTimestamp;
>-    if (decoder.decodeDouble("endOfGrandfatheringTimestamp", endOfGrandfatheringTimestamp))
>-        m_endOfGrandfatheringTimestamp = WallTime::fromRawSeconds(endOfGrandfatheringTimestamp);
>-    else
>-        m_endOfGrandfatheringTimestamp = { };
>-
>-    Vector<ResourceLoadStatistics> loadedStatistics;
>-    bool succeeded = decoder.decodeObjects("browsingStatistics", loadedStatistics, [versionOnDisk](KeyedDecoder& decoderInner, ResourceLoadStatistics& statistics) {
>-        return statistics.decode(decoderInner, versionOnDisk);
>-    });
>-
>-    if (!succeeded)
>-        return;
>-
>-    mergeStatistics(WTFMove(loadedStatistics));
>-    updateCookiePartitioning([]() { });
>-
>-    Vector<OperatingDate> operatingDates;
>-    succeeded = decoder.decodeObjects("operatingDates", operatingDates, [](KeyedDecoder& decoder, OperatingDate& date) {
>-        double value;
>-        if (!decoder.decodeDouble("date", value))
>-            return false;
>-
>-        date = OperatingDate::fromWallTime(WallTime::fromRawSeconds(value));
>-        return true;
>+    ASSERT(RunLoop::isMain());
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), seconds] {
>+        if (m_memoryStore)
>+            m_memoryStore->setTimeToLiveUserInteraction(seconds);
>     });
>-
>-    if (!succeeded)
>-        return;
>-
>-    m_operatingDates = mergeOperatingDates(m_operatingDates, WTFMove(operatingDates));
>-}
>-
>-void WebResourceLoadStatisticsStore::clearInMemory()
>-{
>-    ASSERT(!RunLoop::isMain());
>-    m_resourceStatisticsMap.clear();
>-    m_operatingDates.clear();
>-
>-    removeAllStorageAccess();
>-    updateCookiePartitioningForDomains({ }, { }, { }, ShouldClearFirst::Yes, []() { });
>-}
>-
>-bool WebResourceLoadStatisticsStore::wasAccessedAsFirstPartyDueToUserInteraction(const ResourceLoadStatistics& current, const ResourceLoadStatistics& updated)
>-{
>-    if (!current.hadUserInteraction && !updated.hadUserInteraction)
>-        return false;
>-
>-    auto mostRecentUserInteractionTime = std::max(current.mostRecentUserInteractionTime, updated.mostRecentUserInteractionTime);
>-
>-    return updated.lastSeen <= mostRecentUserInteractionTime + m_parameters.timeToLiveCookiePartitionFree;
> }
> 
>-void WebResourceLoadStatisticsStore::mergeStatistics(Vector<ResourceLoadStatistics>&& statistics)
>-{
>-    ASSERT(!RunLoop::isMain());
>-    for (auto& statistic : statistics) {
>-        auto result = m_resourceStatisticsMap.ensure(statistic.highLevelDomain, [&statistic] {
>-            return WTFMove(statistic);
>-        });
>-        if (!result.isNewEntry) {
>-            if (wasAccessedAsFirstPartyDueToUserInteraction(result.iterator->value, statistic))
>-                result.iterator->value.timesAccessedAsFirstPartyDueToUserInteraction++;
>-            result.iterator->value.merge(statistic);
>-        }
>-    }
>-}
>-
>-bool WebResourceLoadStatisticsStore::shouldPartitionCookies(const ResourceLoadStatistics& statistic) const
>-{
>-    return statistic.isPrevalentResource && statistic.hadUserInteraction;
>-}
>-
>-bool WebResourceLoadStatisticsStore::shouldBlockCookies(const ResourceLoadStatistics& statistic) const
>-{
>-    return statistic.isPrevalentResource && !statistic.hadUserInteraction;
>-}
>-
>-bool WebResourceLoadStatisticsStore::hasUserGrantedStorageAccessThroughPrompt(const ResourceLoadStatistics& statistic, const String& firstPartyPrimaryDomain) const
>-{
>-    return statistic.storageAccessUnderTopFrameOrigins.contains(firstPartyPrimaryDomain);
>-}
>-
>-void WebResourceLoadStatisticsStore::updateCookiePartitioning(CompletionHandler<void()>&& completionHandler)
>+void WebResourceLoadStatisticsStore::setTimeToLiveCookiePartitionFree(Seconds seconds)
> {
>-    ASSERT(!RunLoop::isMain());
>-
>-    Vector<String> domainsToPartition;
>-    Vector<String> domainsToBlock;
>-    Vector<String> domainsToNeitherPartitionNorBlock;
>-    for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>-
>-        bool shouldPartition = shouldPartitionCookies(resourceStatistic);
>-        bool shouldBlock = shouldBlockCookies(resourceStatistic);
>-
>-        if (shouldPartition && !resourceStatistic.isMarkedForCookiePartitioning) {
>-            domainsToPartition.append(resourceStatistic.highLevelDomain);
>-            resourceStatistic.isMarkedForCookiePartitioning = true;
>-        } else if (shouldBlock && !resourceStatistic.isMarkedForCookieBlocking) {
>-            domainsToBlock.append(resourceStatistic.highLevelDomain);
>-            resourceStatistic.isMarkedForCookieBlocking = true;
>-        } else if (!shouldPartition && !shouldBlock && resourceStatistic.isPrevalentResource) {
>-            domainsToNeitherPartitionNorBlock.append(resourceStatistic.highLevelDomain);
>-            resourceStatistic.isMarkedForCookiePartitioning = false;
>-            resourceStatistic.isMarkedForCookieBlocking = false;
>-        }
>-    }
>-
>-    if (domainsToPartition.isEmpty() && domainsToBlock.isEmpty() && domainsToNeitherPartitionNorBlock.isEmpty()) {
>-        completionHandler();
>-        return;
>-    }
>-
>-#if !RELEASE_LOG_DISABLED
>-    if (m_debugLoggingEnabled) {
>-        if (!domainsToPartition.isEmpty()) {
>-            StringBuilder domainsToPartitionBuilder;
>-            bool isFirstDomain = true;
>-            for (auto& domain : domainsToPartition) {
>-                appendWithDelimiter(domainsToPartitionBuilder, domain, isFirstDomain);
>-                isFirstDomain = false;
>-            }
>-            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to partition cookies in third-party contexts for %{public}s.", domainsToPartitionBuilder.toString().utf8().data());
>-        }
>-
>-        if (!domainsToBlock.isEmpty()) {
>-            StringBuilder domainsToBlockBuilder;
>-            bool isFirstDomain = true;
>-            for (auto& domain : domainsToBlock) {
>-                appendWithDelimiter(domainsToBlockBuilder, domain, isFirstDomain);
>-                isFirstDomain = false;
>-            }
>-            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to block cookies in third-party contexts for %{public}s.", domainsToBlockBuilder.toString().utf8().data());
>-        }
>-
>-        if (!domainsToNeitherPartitionNorBlock.isEmpty()) {
>-            StringBuilder domainsToNeitherPartitionNorBlockBuilder;
>-            bool isFirstDomain = true;
>-            for (auto& domain : domainsToNeitherPartitionNorBlock) {
>-                appendWithDelimiter(domainsToNeitherPartitionNorBlockBuilder, domain, isFirstDomain);
>-                isFirstDomain = false;
>-            }
>-            RELEASE_LOG_INFO(ResourceLoadStatisticsDebug, "About to neither partition nor block cookies in third-party contexts for %{public}s.", domainsToNeitherPartitionNorBlockBuilder.toString().utf8().data());
>-        }
>-    }
>-#endif
>-
>-    RunLoop::main().dispatch([this, protectedThis = makeRef(*this), domainsToPartition = crossThreadCopy(domainsToPartition), domainsToBlock = crossThreadCopy(domainsToBlock), domainsToNeitherPartitionNorBlock = crossThreadCopy(domainsToNeitherPartitionNorBlock), completionHandler = WTFMove(completionHandler)] () mutable {
>-        m_updatePrevalentDomainsToPartitionOrBlockCookiesHandler(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, ShouldClearFirst::No, [this, protectedThis = WTFMove(protectedThis), completionHandler = WTFMove(completionHandler)]() mutable {
>-            m_statisticsQueue->dispatch([completionHandler = WTFMove(completionHandler)]() mutable {
>-                completionHandler();
>-            });
>-        });
>-#if !RELEASE_LOG_DISABLED
>-        RELEASE_LOG_INFO_IF(m_debugLoggingEnabled, ResourceLoadStatisticsDebug, "Done updating cookie partitioning and blocking.");
>-#endif
>+    ASSERT(RunLoop::isMain());
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), seconds] {
>+        if (m_memoryStore)
>+            m_memoryStore->setTimeToLiveCookiePartitionFree(seconds);
>     });
> }
> 
>-void WebResourceLoadStatisticsStore::updateCookiePartitioningForDomains(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst shouldClearFirst, CompletionHandler<void()>&& completionHandler)
>+void WebResourceLoadStatisticsStore::setMinimumTimeBetweenDataRecordsRemoval(Seconds seconds)
> {
>-    ASSERT(!RunLoop::isMain());
>-    if (domainsToPartition.isEmpty() && domainsToBlock.isEmpty() && domainsToNeitherPartitionNorBlock.isEmpty() && shouldClearFirst == ShouldClearFirst::No) {
>-        completionHandler();
>-        return;
>-    }
>-    
>-    if (shouldClearFirst == ShouldClearFirst::Yes)
>-        resetCookiePartitioningState();
>-    else {
>-        for (auto& domain : domainsToNeitherPartitionNorBlock) {
>-            auto& statistic = ensureResourceStatisticsForPrimaryDomain(domain);
>-            statistic.isMarkedForCookiePartitioning = false;
>-            statistic.isMarkedForCookieBlocking = false;
>-        }
>-    }
>-
>-    for (auto& domain : domainsToPartition)
>-        ensureResourceStatisticsForPrimaryDomain(domain).isMarkedForCookiePartitioning = true;
>-
>-    for (auto& domain : domainsToBlock)
>-        ensureResourceStatisticsForPrimaryDomain(domain).isMarkedForCookieBlocking = true;
>-
>-    RunLoop::main().dispatch([this, shouldClearFirst, protectedThis = makeRef(*this), domainsToPartition = crossThreadCopy(domainsToPartition), domainsToBlock = crossThreadCopy(domainsToBlock), domainsToNeitherPartitionNorBlock = crossThreadCopy(domainsToNeitherPartitionNorBlock), completionHandler = WTFMove(completionHandler)] () mutable {
>-        m_updatePrevalentDomainsToPartitionOrBlockCookiesHandler(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, shouldClearFirst, [this, protectedThis = WTFMove(protectedThis), completionHandler = WTFMove(completionHandler)]() mutable {
>-            m_statisticsQueue->dispatch([completionHandler = WTFMove(completionHandler)]() mutable {
>-                completionHandler();
>-            });
>-        });
>+    ASSERT(RunLoop::isMain());
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), seconds] {
>+        if (m_memoryStore)
>+            m_memoryStore->setMinimumTimeBetweenDataRecordsRemoval(seconds);
>     });
> }
> 
>-void WebResourceLoadStatisticsStore::clearPartitioningStateForDomains(const Vector<String>& domains, CompletionHandler<void()>&& completionHandler)
>+void WebResourceLoadStatisticsStore::setGrandfatheringTime(Seconds seconds)
> {
>-    ASSERT(!RunLoop::isMain());
>-    if (domains.isEmpty()) {
>-        completionHandler();
>-        return;
>-    }
>-
>-    RunLoop::main().dispatch([this, protectedThis = makeRef(*this), domains = crossThreadCopy(domains)] () {
>-        m_removeDomainsHandler(domains);
>+    ASSERT(RunLoop::isMain());
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), seconds] {
>+        if (m_memoryStore)
>+            m_memoryStore->setGrandfatheringTime(seconds);
>     });
>-
>-    for (auto& domain : domains) {
>-        auto& statistic = ensureResourceStatisticsForPrimaryDomain(domain);
>-        statistic.isMarkedForCookiePartitioning = false;
>-        statistic.isMarkedForCookieBlocking = false;
>-    }
>-
>-    completionHandler();
>-}
>-
>-void WebResourceLoadStatisticsStore::resetCookiePartitioningState()
>-{
>-    ASSERT(!RunLoop::isMain());
>-    for (auto& resourceStatistic : m_resourceStatisticsMap.values()) {
>-        resourceStatistic.isMarkedForCookiePartitioning = false;
>-        resourceStatistic.isMarkedForCookieBlocking = false;
>-    }
>-}
>-
>-void WebResourceLoadStatisticsStore::processStatistics(const WTF::Function<void (const ResourceLoadStatistics&)>& processFunction) const
>-{
>-    ASSERT(!RunLoop::isMain());
>-    for (auto& resourceStatistic : m_resourceStatisticsMap.values())
>-        processFunction(resourceStatistic);
>-}
>-
>-bool WebResourceLoadStatisticsStore::hasHadUnexpiredRecentUserInteraction(ResourceLoadStatistics& resourceStatistic) const
>-{
>-    if (resourceStatistic.hadUserInteraction && hasStatisticsExpired(resourceStatistic)) {
>-        // Drop privacy sensitive data because we no longer need it.
>-        // Set timestamp to 0 so that statistics merge will know
>-        // it has been reset as opposed to its default -1.
>-        resourceStatistic.mostRecentUserInteractionTime = { };
>-        resourceStatistic.storageAccessUnderTopFrameOrigins.clear();
>-        resourceStatistic.hadUserInteraction = false;
>-    }
>-
>-    return resourceStatistic.hadUserInteraction;
> }
> 
>-Vector<String> WebResourceLoadStatisticsStore::topPrivatelyControlledDomainsToRemoveWebsiteDataFor()
>+void WebResourceLoadStatisticsStore::callUpdatePrevalentDomainsToPartitionOrBlockCookiesHandler(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst shouldClearFirst, CompletionHandler<void()>&& completionHandler)
> {
>-    ASSERT(!RunLoop::isMain());
>-
>-    bool shouldCheckForGrandfathering = m_endOfGrandfatheringTimestamp > WallTime::now();
>-    bool shouldClearGrandfathering = !shouldCheckForGrandfathering && m_endOfGrandfatheringTimestamp;
>-
>-    if (shouldClearGrandfathering)
>-        m_endOfGrandfatheringTimestamp = { };
>-
>-    Vector<String> prevalentResources;
>-    for (auto& statistic : m_resourceStatisticsMap.values()) {
>-        if (statistic.isPrevalentResource && !hasHadUnexpiredRecentUserInteraction(statistic) && (!shouldCheckForGrandfathering || !statistic.grandfathered))
>-            prevalentResources.append(statistic.highLevelDomain);
>-
>-        if (shouldClearGrandfathering && statistic.grandfathered)
>-            statistic.grandfathered = false;
>-    }
>-
>-    return prevalentResources;
>-}
>-
>-void WebResourceLoadStatisticsStore::includeTodayAsOperatingDateIfNecessary()
>-{
>-    ASSERT(!RunLoop::isMain());
>-
>-    auto today = OperatingDate::today();
>-    if (!m_operatingDates.isEmpty() && today <= m_operatingDates.last())
>-        return;
>-
>-    while (m_operatingDates.size() >= operatingDatesWindow)
>-        m_operatingDates.remove(0);
>-
>-    m_operatingDates.append(today);
>+    ASSERT(RunLoop::isMain());
>+    m_updatePrevalentDomainsToPartitionOrBlockCookiesHandler(domainsToPartition, domainsToBlock, domainsToNeitherPartitionNorBlock, shouldClearFirst, WTFMove(completionHandler));
> }
> 
>-bool WebResourceLoadStatisticsStore::hasStatisticsExpired(const ResourceLoadStatistics& resourceStatistic) const
>+void WebResourceLoadStatisticsStore::callRemoveDomainsHandler(const Vector<String>& domains)
> {
>-    if (m_operatingDates.size() >= operatingDatesWindow) {
>-        if (OperatingDate::fromWallTime(resourceStatistic.mostRecentUserInteractionTime) < m_operatingDates.first())
>-            return true;
>-    }
>-
>-    // If we don't meet the real criteria for an expired statistic, check the user setting for a tighter restriction (mainly for testing).
>-    if (m_parameters.timeToLiveUserInteraction) {
>-        if (WallTime::now() > resourceStatistic.mostRecentUserInteractionTime + m_parameters.timeToLiveUserInteraction.value())
>-            return true;
>-    }
>+    ASSERT(RunLoop::isMain());
> 
>-    return false;
>+    m_removeDomainsHandler(domains);
> }
>     
> void WebResourceLoadStatisticsStore::setMaxStatisticsEntries(size_t maximumEntryCount)
> {
>-    m_parameters.maxStatisticsEntries = maximumEntryCount;
>+    ASSERT(RunLoop::isMain());
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), maximumEntryCount] {
>+        if (m_memoryStore)
>+            m_memoryStore->setMaxStatisticsEntries(maximumEntryCount);
>+    });
> }
>     
> void WebResourceLoadStatisticsStore::setPruneEntriesDownTo(size_t pruneTargetCount)
> {
>-    m_parameters.pruneEntriesDownTo = pruneTargetCount;
>-}
>-    
>-struct StatisticsLastSeen {
>-    String topPrivatelyOwnedDomain;
>-    WallTime lastSeen;
>-};
>-    
>-static void pruneResources(HashMap<String, WebCore::ResourceLoadStatistics>& statisticsMap, Vector<StatisticsLastSeen>& statisticsToPrune, size_t& numberOfEntriesToPrune)
>-{
>-    if (statisticsToPrune.size() > numberOfEntriesToPrune) {
>-        std::sort(statisticsToPrune.begin(), statisticsToPrune.end(), [](const StatisticsLastSeen& a, const StatisticsLastSeen& b) {
>-            return a.lastSeen < b.lastSeen;
>-        });
>-    }
>-
>-    for (size_t i = 0, end = std::min(numberOfEntriesToPrune, statisticsToPrune.size()); i != end; ++i, --numberOfEntriesToPrune)
>-        statisticsMap.remove(statisticsToPrune[i].topPrivatelyOwnedDomain);
>-}
>-    
>-static unsigned computeImportance(const ResourceLoadStatistics& resourceStatistic)
>-{
>-    unsigned importance = maxImportance;
>-    if (!resourceStatistic.isPrevalentResource)
>-        importance -= 1;
>-    if (!resourceStatistic.hadUserInteraction)
>-        importance -= 2;
>-    return importance;
>-}
>-    
>-void WebResourceLoadStatisticsStore::pruneStatisticsIfNeeded()
>-{
>-    ASSERT(!RunLoop::isMain());
>-    if (m_resourceStatisticsMap.size() <= m_parameters.maxStatisticsEntries)
>-        return;
>-
>-    ASSERT(m_parameters.pruneEntriesDownTo <= m_parameters.maxStatisticsEntries);
>-
>-    size_t numberOfEntriesLeftToPrune = m_resourceStatisticsMap.size() - m_parameters.pruneEntriesDownTo;
>-    ASSERT(numberOfEntriesLeftToPrune);
>-    
>-    Vector<StatisticsLastSeen> resourcesToPrunePerImportance[maxImportance + 1];
>-    for (auto& resourceStatistic : m_resourceStatisticsMap.values())
>-        resourcesToPrunePerImportance[computeImportance(resourceStatistic)].append({ resourceStatistic.highLevelDomain, resourceStatistic.lastSeen });
>-    
>-    for (unsigned importance = 0; numberOfEntriesLeftToPrune && importance <= maxImportance; ++importance)
>-        pruneResources(m_resourceStatisticsMap, resourcesToPrunePerImportance[importance], numberOfEntriesLeftToPrune);
>+    ASSERT(RunLoop::isMain());
> 
>-    ASSERT(!numberOfEntriesLeftToPrune);
>+    m_statisticsQueue->dispatch([this, protectedThis = makeRef(*this), pruneTargetCount] {
>+        if (m_memoryStore)
>+            m_memoryStore->setPruneEntriesDownTo(pruneTargetCount);
>+    });
> }
> 
> void WebResourceLoadStatisticsStore::resetParametersToDefaultValues()
> {
>-    m_parameters = { };
>+    ASSERT(RunLoop::isMain());
>+
>+    m_statisticsQueue->dispatch([this, protectedThis(makeRef(*this))] {
>+        if (m_memoryStore)
>+            m_memoryStore->resetParametersToDefaultValues();
>+    });
> }
> 
> void WebResourceLoadStatisticsStore::logTestingEvent(const String& event)
> {
>-    if (!m_statisticsTestingCallback)
>-        return;
>+    ASSERT(RunLoop::isMain());
> 
>-    if (RunLoop::isMain())
>+    if (m_statisticsTestingCallback)
>         m_statisticsTestingCallback(event);
>-    else {
>-        RunLoop::main().dispatch([this, protectedThis = makeRef(*this), event = event.isolatedCopy()] {
>-            if (m_statisticsTestingCallback)
>-                m_statisticsTestingCallback(event);
>-        });
>-    }
> }
> 
> } // namespace WebKit
>diff --git a/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.h b/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.h
>index 96a529f484bc56d4d2c67fd0e872e128bacd3ba2..c52a2055fbfca8e36a02244e9f971216e10aa523 100644
>--- a/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.h
>+++ b/Source/WebKit/UIProcess/WebResourceLoadStatisticsStore.h
>@@ -26,28 +26,18 @@
> #pragma once
> 
> #include "Connection.h"
>-#include "ResourceLoadStatisticsClassifier.h"
>-#include "ResourceLoadStatisticsPersistentStorage.h"
> #include "WebsiteDataType.h"
> #include <wtf/CompletionHandler.h>
>-#include <wtf/HashSet.h>
>-#include <wtf/MonotonicTime.h>
> #include <wtf/RunLoop.h>
> #include <wtf/Vector.h>
> #include <wtf/WallTime.h>
> #include <wtf/text/WTFString.h>
> 
>-#if HAVE(CORE_PREDICTION)
>-#include "ResourceLoadStatisticsClassifierCocoa.h"
>-#endif
>-
> namespace WTF {
> class WorkQueue;
> }
> 
> namespace WebCore {
>-class KeyedDecoder;
>-class KeyedEncoder;
> class ResourceRequest;
> class URL;
> struct ResourceLoadStatistics;
>@@ -55,7 +45,8 @@ struct ResourceLoadStatistics;
> 
> namespace WebKit {
> 
>-class OperatingDate;
>+class ResourceLoadStatisticsMemoryStore;
>+class ResourceLoadStatisticsPersistentStorage;
> class WebFrameProxy;
> class WebProcessProxy;
> 
>@@ -68,12 +59,12 @@ enum class StorageAccessStatus {
> 
> class WebResourceLoadStatisticsStore final : public IPC::Connection::WorkQueueMessageReceiver {
> public:
>-    using UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler = WTF::Function<void(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst, CompletionHandler<void()>&&)>;
>-    using HasStorageAccessForFrameHandler = WTF::Function<void(const String& resourceDomain, const String& firstPartyDomain, uint64_t frameID, uint64_t pageID, WTF::Function<void(bool hasAccess)>&& callback)>;
>-    using GrantStorageAccessHandler = WTF::Function<void(const String& resourceDomain, const String& firstPartyDomain, std::optional<uint64_t> frameID, uint64_t pageID, WTF::Function<void(bool wasGranted)>&& callback)>;
>-    using RemoveAllStorageAccessHandler = WTF::Function<void()>;
>-    using RemovePrevalentDomainsHandler = WTF::Function<void (const Vector<String>&)>;
>-    static Ref<WebResourceLoadStatisticsStore> create(const String& resourceLoadStatisticsDirectory, Function<void (const String&)>&& testingCallback, bool isEphemeral, UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler&& updatePrevalentDomainsToPartitionOrBlockCookiesHandler = [](const WTF::Vector<String>&, const WTF::Vector<String>&, const WTF::Vector<String>&, ShouldClearFirst, CompletionHandler<void()>&& callback = []() { }) { }, HasStorageAccessForFrameHandler&& hasStorageAccessForFrameHandler = [](const String&, const String&, uint64_t, uint64_t, WTF::Function<void(bool)>&&) { }, GrantStorageAccessHandler&& grantStorageAccessHandler = [](const String&, const String&, std::optional<uint64_t>, uint64_t, WTF::Function<void(bool)>&&) { }, RemoveAllStorageAccessHandler&& removeAllStorageAccessHandler = []() { }, RemovePrevalentDomainsHandler&& removeDomainsHandler = [] (const WTF::Vector<String>&) { })
>+    using UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler = Function<void(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst, CompletionHandler<void()>&&)>;
>+    using HasStorageAccessForFrameHandler = Function<void(const String& resourceDomain, const String& firstPartyDomain, uint64_t frameID, uint64_t pageID, Function<void(bool hasAccess)>&& callback)>;
>+    using GrantStorageAccessHandler = Function<void(const String& resourceDomain, const String& firstPartyDomain, std::optional<uint64_t> frameID, uint64_t pageID, Function<void(bool wasGranted)>&& callback)>;
>+    using RemoveAllStorageAccessHandler = Function<void()>;
>+    using RemovePrevalentDomainsHandler = Function<void(const Vector<String>&)>;
>+    static Ref<WebResourceLoadStatisticsStore> create(const String& resourceLoadStatisticsDirectory, Function<void (const String&)>&& testingCallback, bool isEphemeral, UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler&& updatePrevalentDomainsToPartitionOrBlockCookiesHandler = [](const Vector<String>&, const Vector<String>&, const Vector<String>&, ShouldClearFirst, CompletionHandler<void()>&& callback = []() { }) { }, HasStorageAccessForFrameHandler&& hasStorageAccessForFrameHandler = [](const String&, const String&, uint64_t, uint64_t, Function<void(bool)>&&) { }, GrantStorageAccessHandler&& grantStorageAccessHandler = [](const String&, const String&, std::optional<uint64_t>, uint64_t, Function<void(bool)>&&) { }, RemoveAllStorageAccessHandler&& removeAllStorageAccessHandler = []() { }, RemovePrevalentDomainsHandler&& removeDomainsHandler = [] (const Vector<String>&) { })
>     {
>         return adoptRef(*new WebResourceLoadStatisticsStore(resourceLoadStatisticsDirectory, WTFMove(testingCallback), isEphemeral, WTFMove(updatePrevalentDomainsToPartitionOrBlockCookiesHandler), WTFMove(hasStorageAccessForFrameHandler), WTFMove(grantStorageAccessHandler), WTFMove(removeAllStorageAccessHandler), WTFMove(removeDomainsHandler)));
>     }
>@@ -82,16 +73,15 @@ public:
> 
>     static const OptionSet<WebsiteDataType>& monitoredDataTypes();
> 
>-    bool isEmpty() const { return m_resourceStatisticsMap.isEmpty(); }
>     WorkQueue& statisticsQueue() { return m_statisticsQueue.get(); }
> 
>-    void setNotifyPagesWhenDataRecordsWereScanned(bool value) { m_parameters.shouldNotifyPagesWhenDataRecordsWereScanned = value; }
>-    void setShouldClassifyResourcesBeforeDataRecordsRemoval(bool value) { m_parameters.shouldClassifyResourcesBeforeDataRecordsRemoval = value; }
>-    void setShouldSubmitTelemetry(bool value) { m_parameters.shouldSubmitTelemetry = value; }
>+    void setNotifyPagesWhenDataRecordsWereScanned(bool);
>+    void setShouldClassifyResourcesBeforeDataRecordsRemoval(bool);
>+    void setShouldSubmitTelemetry(bool);
> 
>     void resourceLoadStatisticsUpdated(Vector<WebCore::ResourceLoadStatistics>&& origins);
> 
>-    void hasStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, WTF::CompletionHandler<void (bool)>&& callback);
>+    void hasStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, CompletionHandler<void(bool)>&& callback);
>     void requestStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool promptEnabled, CompletionHandler<void(StorageAccessStatus)>&&);
>     void requestStorageAccessUnderOpener(String&& primaryDomainInNeedOfStorageAccess, uint64_t openerPageID, String&& openerPrimaryDomain, bool isTriggeredByUserGesture);
>     void grantStorageAccess(String&& subFrameHost, String&& topFrameHost, uint64_t frameID, uint64_t pageID, bool userWasPromptedNow, CompletionHandler<void(bool)>&&);
>@@ -144,91 +134,34 @@ public:
>     void setGrandfatheringTime(Seconds);
>     void setMaxStatisticsEntries(size_t);
>     void setPruneEntriesDownTo(size_t);
>-    
>-    void processStatistics(const WTF::Function<void (const WebCore::ResourceLoadStatistics&)>&) const;
>-    void pruneStatisticsIfNeeded();
> 
>     void resetParametersToDefaultValues();
> 
>-    std::unique_ptr<WebCore::KeyedEncoder> createEncoderFromData() const;
>-    void mergeWithDataFromDecoder(WebCore::KeyedDecoder&);
>-    void clearInMemory();
>-    void grandfatherExistingWebsiteData(CompletionHandler<void()>&&);
>-
>     void setResourceLoadStatisticsDebugMode(bool);
> 
>     void setStatisticsTestingCallback(Function<void (const String&)>&& callback) { m_statisticsTestingCallback = WTFMove(callback); }
>     void logTestingEvent(const String&);
>+    void callGrantStorageAccessHandler(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain, std::optional<uint64_t> frameID, uint64_t pageID, CompletionHandler<void(bool)>&&);
>+    void removeAllStorageAccess();
>+    void callUpdatePrevalentDomainsToPartitionOrBlockCookiesHandler(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst, CompletionHandler<void()>&&);
>+    void callRemoveDomainsHandler(const Vector<String>& domains);
>+    void callHasStorageAccessForFrameHandler(const String& resourceDomain, const String& firstPartyDomain, uint64_t frameID, uint64_t pageID, Function<void(bool)>&&);
> 
> private:
>     WebResourceLoadStatisticsStore(const String&, Function<void(const String&)>&& testingCallback, bool isEphemeral, UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler&&, HasStorageAccessForFrameHandler&&, GrantStorageAccessHandler&&, RemoveAllStorageAccessHandler&&, RemovePrevalentDomainsHandler&&);
> 
>-    void removeDataRecords(CompletionHandler<void()>&&);
>-
>     // IPC::MessageReceiver
>     void didReceiveMessage(IPC::Connection&, IPC::Decoder&) override;
> 
>     void performDailyTasks();
>-    bool shouldRemoveDataRecords() const;
>-    void setDataRecordsBeingRemoved(bool);
>-
>-    bool shouldPartitionCookies(const WebCore::ResourceLoadStatistics&) const;
>-    bool shouldBlockCookies(const WebCore::ResourceLoadStatistics&) const;
>-    bool hasUserGrantedStorageAccessThroughPrompt(const WebCore::ResourceLoadStatistics&, const String& firstPartyPrimaryDomain) const;
>-    bool hasStatisticsExpired(const WebCore::ResourceLoadStatistics&) const;
>-    bool hasHadUnexpiredRecentUserInteraction(WebCore::ResourceLoadStatistics&) const;
>-    void includeTodayAsOperatingDateIfNecessary();
>-    Vector<String> topPrivatelyControlledDomainsToRemoveWebsiteDataFor();
>-    void updateCookiePartitioning(CompletionHandler<void()>&&);
>-    void updateCookiePartitioningForDomains(const Vector<String>& domainsToPartition, const Vector<String>& domainsToBlock, const Vector<String>& domainsToNeitherPartitionNorBlock, ShouldClearFirst, CompletionHandler<void()>&&);
>-    void clearPartitioningStateForDomains(const Vector<String>& domains, CompletionHandler<void()>&&);
>-    void mergeStatistics(Vector<WebCore::ResourceLoadStatistics>&&);
>-    WebCore::ResourceLoadStatistics& ensureResourceStatisticsForPrimaryDomain(const String&);
>-    unsigned recursivelyGetAllDomainsThatHaveRedirectedToThisDomain(const WebCore::ResourceLoadStatistics&, HashSet<String>& domainsThatHaveRedirectedTo, unsigned numberOfRecursiveCalls);
>-    void markAsPrevalentIfHasRedirectedToPrevalent(WebCore::ResourceLoadStatistics&);
>-    void setPrevalentResource(WebCore::ResourceLoadStatistics&, ResourceLoadPrevalence);
>-    void processStatisticsAndDataRecords();
>-
>-    void scheduleStatisticsProcessingRequestIfNecessary();
>-    void cancelPendingStatisticsProcessingRequest();
>-
>-    void resetCookiePartitioningState();
>-    StorageAccessStatus storageAccessStatus(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain);
>-    void grantStorageAccessInternal(String&& subFrameHost, String&& topFrameHost, std::optional<uint64_t> frameID, uint64_t pageID, bool userWasPromptedNowOrEarlier, CompletionHandler<void(bool)>&&);
>-    void removeAllStorageAccess();
> 
>-    void setDebugLogggingEnabled(bool enabled) { m_debugLoggingEnabled  = enabled; }
>-    void setStorageAccessPromptsEnabled(bool enabled) { m_storageAccessPromptsEnabled  = enabled; }
>+    StorageAccessStatus storageAccessStatus(const String& subFramePrimaryDomain, const String& topFramePrimaryDomain);
> 
>     void flushAndDestroyPersistentStore();
> 
>-#if PLATFORM(COCOA)
>-    void registerUserDefaultsIfNeeded();
>-#endif
>-
>-    bool wasAccessedAsFirstPartyDueToUserInteraction(const WebCore::ResourceLoadStatistics& current, const WebCore::ResourceLoadStatistics& updated);
>-
>-    struct Parameters {
>-        size_t pruneEntriesDownTo { 800 };
>-        size_t maxStatisticsEntries { 1000 };
>-        std::optional<Seconds> timeToLiveUserInteraction;
>-        Seconds timeToLiveCookiePartitionFree { 24_h };
>-        Seconds minimumTimeBetweenDataRecordsRemoval { 1_h };
>-        Seconds grandfatheringTime { 24_h * 7 };
>-        bool shouldNotifyPagesWhenDataRecordsWereScanned { false };
>-        bool shouldClassifyResourcesBeforeDataRecordsRemoval { true };
>-        bool shouldSubmitTelemetry { true };
>-    };
>-
>-    HashMap<String, WebCore::ResourceLoadStatistics> m_resourceStatisticsMap;
>-#if HAVE(CORE_PREDICTION)
>-    ResourceLoadStatisticsClassifierCocoa m_resourceLoadStatisticsClassifier;
>-#else
>-    ResourceLoadStatisticsClassifier m_resourceLoadStatisticsClassifier;
>-#endif
>-    Ref<WTF::WorkQueue> m_statisticsQueue;
>+    Ref<WorkQueue> m_statisticsQueue;
>+    std::unique_ptr<ResourceLoadStatisticsMemoryStore> m_memoryStore;
>     std::unique_ptr<ResourceLoadStatisticsPersistentStorage> m_persistentStorage;
>-    Vector<OperatingDate> m_operatingDates;
> 
>     UpdatePrevalentDomainsToPartitionOrBlockCookiesHandler m_updatePrevalentDomainsToPartitionOrBlockCookiesHandler;
>     HasStorageAccessForFrameHandler m_hasStorageAccessForFrameHandler;
>@@ -236,26 +169,11 @@ private:
>     RemoveAllStorageAccessHandler m_removeAllStorageAccessHandler;
>     RemovePrevalentDomainsHandler m_removeDomainsHandler;
> 
>-    WallTime m_endOfGrandfatheringTimestamp;
>     RunLoop::Timer<WebResourceLoadStatisticsStore> m_dailyTasksTimer;
>-    MonotonicTime m_lastTimeDataRecordsWereRemoved;
> 
>-    Parameters m_parameters;
>-
>-#if ENABLE(NETSCAPE_PLUGIN_API)
>-    HashSet<uint64_t> m_activePluginTokens;
>-#endif
>-    bool m_dataRecordsBeingRemoved { false };
>-
>-    bool m_debugModeEnabled { false };
>-    bool m_debugLoggingEnabled { false };
>-    bool m_storageAccessPromptsEnabled { false };
>     bool m_hasScheduledProcessStats { false };
> 
>     Function<void (const String&)> m_statisticsTestingCallback;
>-
>-    uint64_t m_lastStatisticsProcessingRequestIdentifier { 0 };
>-    std::optional<uint64_t> m_pendingStatisticsProcessingRequestIdentifier;
> };
> 
> } // namespace WebKit
>diff --git a/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.cpp b/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.cpp
>index 0b9f7863bb601178c563ff9dc36c4871937e58e2..f9692e12912a6c1c098d3b9f60804ae2ff37df9a 100644
>--- a/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.cpp
>+++ b/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.cpp
>@@ -26,9 +26,9 @@
> #include "config.h"
> #include "WebResourceLoadStatisticsTelemetry.h"
> 
>+#include "ResourceLoadStatisticsMemoryStore.h"
> #include "WebProcessPool.h"
> #include "WebProcessProxy.h"
>-#include "WebResourceLoadStatisticsStore.h"
> #include <WebCore/DiagnosticLoggingKeys.h>
> #include <WebCore/ResourceLoadStatistics.h>
> #include <wtf/MainThread.h>
>@@ -54,7 +54,7 @@ struct PrevalentResourceTelemetry {
>     unsigned timesAccessedAsFirstPartyDueToStorageAccessAPI;
> };
> 
>-static Vector<PrevalentResourceTelemetry> sortedPrevalentResourceTelemetry(const WebResourceLoadStatisticsStore& store)
>+static Vector<PrevalentResourceTelemetry> sortedPrevalentResourceTelemetry(const ResourceLoadStatisticsMemoryStore& store)
> {
>     ASSERT(!RunLoop::isMain());
>     Vector<PrevalentResourceTelemetry> sorted;
>@@ -240,7 +240,7 @@ void static notifyPages(const Vector<PrevalentResourceTelemetry>& sortedPrevalen
>     notifyPages(sortedPrevalentResources.size(), totalNumberOfPrevalentResourcesWithUserInteraction, median(sortedPrevalentResourcesWithoutUserInteraction, 0, 2, subframeUnderTopFrameOriginsGetter));
> }
>     
>-void WebResourceLoadStatisticsTelemetry::calculateAndSubmit(const WebResourceLoadStatisticsStore& resourceLoadStatisticsStore)
>+void WebResourceLoadStatisticsTelemetry::calculateAndSubmit(const ResourceLoadStatisticsMemoryStore& resourceLoadStatisticsStore)
> {
>     ASSERT(!RunLoop::isMain());
>     
>diff --git a/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.h b/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.h
>index d89fafa2fcb453d643340ef14a7444bf1792feed..f96e61a1af0ab7353b031db753f9ddb6f52c629b 100644
>--- a/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.h
>+++ b/Source/WebKit/UIProcess/WebResourceLoadStatisticsTelemetry.h
>@@ -29,11 +29,11 @@
> 
> namespace WebKit {
> 
>-class WebResourceLoadStatisticsStore;
>+class ResourceLoadStatisticsMemoryStore;
> 
> namespace WebResourceLoadStatisticsTelemetry {
>     
>-void calculateAndSubmit(const WebResourceLoadStatisticsStore&);
>+void calculateAndSubmit(const ResourceLoadStatisticsMemoryStore&);
> void setNotifyPagesWhenTelemetryWasCaptured(bool);
>     
> }
>diff --git a/Source/WebKit/WebKit.xcodeproj/project.pbxproj b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>index f10b1b8b972489310a86d95aad2a1713ecc5f035..9ab391f1b4461258a2e3c3a321e03661c8e02fe1 100644
>--- a/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>+++ b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>@@ -1324,7 +1324,6 @@
> 		7A8A9D581EF119B0009801AE /* APIInjectedBundleClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 7A8A9D571EF119AA009801AE /* APIInjectedBundleClient.h */; };
> 		7A8A9D5A1EF13029009801AE /* APIInjectedBundleBundleClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 7A8A9D591EF13020009801AE /* APIInjectedBundleBundleClient.h */; };
> 		7A8A9D5C1EF14598009801AE /* APIInjectedBundlePageResourceLoadClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 7A8A9D5B1EF1458E009801AE /* APIInjectedBundlePageResourceLoadClient.h */; };
>-		7AAD175F1EA6AF99003B0894 /* WebResourceLoadStatisticsStoreCocoa.mm in Sources */ = {isa = PBXBuildFile; fileRef = 7AAD175E1EA6AF37003B0894 /* WebResourceLoadStatisticsStoreCocoa.mm */; };
> 		7AB6EA451EEAAE3800037B2B /* APIIconDatabaseClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 7AB6EA441EEAAE2300037B2B /* APIIconDatabaseClient.h */; };
> 		7AB6EA471EEAB6B800037B2B /* APIGeolocationProvider.h in Headers */ = {isa = PBXBuildFile; fileRef = 7AB6EA461EEAB6B000037B2B /* APIGeolocationProvider.h */; };
> 		7AF236201E79A3E400438A05 /* WebErrors.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 7AF2361E1E79A3B400438A05 /* WebErrors.cpp */; };
>@@ -1460,6 +1459,7 @@
> 		8372DB281A67562800C697C5 /* WebPageDiagnosticLoggingClient.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 8372DB261A67562800C697C5 /* WebPageDiagnosticLoggingClient.cpp */; };
> 		8372DB291A67562800C697C5 /* WebPageDiagnosticLoggingClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 8372DB271A67562800C697C5 /* WebPageDiagnosticLoggingClient.h */; };
> 		8372DB2F1A677D4A00C697C5 /* WKDiagnosticLoggingResultType.h in Headers */ = {isa = PBXBuildFile; fileRef = 8372DB2E1A677D4A00C697C5 /* WKDiagnosticLoggingResultType.h */; settings = {ATTRIBUTES = (Private, ); }; };
>+		837A660120E2AD8500A9DBD8 /* ResourceLoadStatisticsMemoryStoreCocoa.mm in Sources */ = {isa = PBXBuildFile; fileRef = 837A660020E2AD8400A9DBD8 /* ResourceLoadStatisticsMemoryStoreCocoa.mm */; };
> 		83891B631A68B3420030F386 /* APIDiagnosticLoggingClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 83891B621A68B3420030F386 /* APIDiagnosticLoggingClient.h */; };
> 		83891B691A68BEBC0030F386 /* _WKDiagnosticLoggingDelegate.h in Headers */ = {isa = PBXBuildFile; fileRef = 83891B681A68BEBC0030F386 /* _WKDiagnosticLoggingDelegate.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		83891B6C1A68C30B0030F386 /* DiagnosticLoggingClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 83891B6A1A68C30B0030F386 /* DiagnosticLoggingClient.h */; };
>@@ -1471,6 +1471,8 @@
> 		839A2F321E2067450039057E /* HighPerformanceGraphicsUsageSampler.h in Headers */ = {isa = PBXBuildFile; fileRef = 839A2F301E2067390039057E /* HighPerformanceGraphicsUsageSampler.h */; };
> 		83A0ED341F747CCD003299EB /* PreconnectTask.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 83A0ED331F747CC7003299EB /* PreconnectTask.cpp */; };
> 		83A0ED351F747CCF003299EB /* PreconnectTask.h in Headers */ = {isa = PBXBuildFile; fileRef = 83A0ED321F747CC6003299EB /* PreconnectTask.h */; };
>+		83B3CB0F20E2AAFE00441E9B /* ResourceLoadStatisticsMemoryStore.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 83681DCB20E2904B00C249CD /* ResourceLoadStatisticsMemoryStore.cpp */; };
>+		83B3CB1020E2AB0100441E9B /* ResourceLoadStatisticsMemoryStore.h in Headers */ = {isa = PBXBuildFile; fileRef = 83681DCA20E2904A00C249CD /* ResourceLoadStatisticsMemoryStore.h */; };
> 		83BDCCB91AC5FDB6003F6441 /* NetworkCacheStatistics.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 83BDCCB81AC5FDB6003F6441 /* NetworkCacheStatistics.cpp */; };
> 		83D454D71BE9D3C4006C93BD /* NetworkLoadClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 83D454D61BE9D3C4006C93BD /* NetworkLoadClient.h */; };
> 		83EE575B1DB7D61100C74C50 /* WebValidationMessageClient.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 83EE57591DB7D60600C74C50 /* WebValidationMessageClient.cpp */; };
>@@ -3805,7 +3807,6 @@
> 		7A9CD8C01C77984900D9F6C7 /* WebResourceLoadStatisticsStore.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WebResourceLoadStatisticsStore.cpp; sourceTree = "<group>"; };
> 		7A9CD8C11C77984900D9F6C7 /* WebResourceLoadStatisticsStore.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebResourceLoadStatisticsStore.h; sourceTree = "<group>"; };
> 		7A9CD8C21C779AD600D9F6C7 /* WebResourceLoadStatisticsStore.messages.in */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = WebResourceLoadStatisticsStore.messages.in; sourceTree = "<group>"; };
>-		7AAD175E1EA6AF37003B0894 /* WebResourceLoadStatisticsStoreCocoa.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = WebResourceLoadStatisticsStoreCocoa.mm; sourceTree = "<group>"; };
> 		7AB6EA441EEAAE2300037B2B /* APIIconDatabaseClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = APIIconDatabaseClient.h; sourceTree = "<group>"; };
> 		7AB6EA461EEAB6B000037B2B /* APIGeolocationProvider.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = APIGeolocationProvider.h; sourceTree = "<group>"; };
> 		7ACFAAD820B88D4F00C53203 /* process-webcontent-entitlements.sh */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.sh; path = "process-webcontent-entitlements.sh"; sourceTree = "<group>"; };
>@@ -3951,10 +3952,13 @@
> 		834B25101A842C8700CFB150 /* NetworkCacheStatistics.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NetworkCacheStatistics.h; sourceTree = "<group>"; };
> 		8360349D1ACB34D600626549 /* WebSQLiteDatabaseTracker.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WebSQLiteDatabaseTracker.cpp; sourceTree = "<group>"; };
> 		8360349E1ACB34D600626549 /* WebSQLiteDatabaseTracker.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebSQLiteDatabaseTracker.h; sourceTree = "<group>"; };
>+		83681DCA20E2904A00C249CD /* ResourceLoadStatisticsMemoryStore.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = ResourceLoadStatisticsMemoryStore.h; sourceTree = "<group>"; };
>+		83681DCB20E2904B00C249CD /* ResourceLoadStatisticsMemoryStore.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = ResourceLoadStatisticsMemoryStore.cpp; sourceTree = "<group>"; };
> 		8372DB241A674C8F00C697C5 /* WKPageDiagnosticLoggingClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WKPageDiagnosticLoggingClient.h; sourceTree = "<group>"; };
> 		8372DB261A67562800C697C5 /* WebPageDiagnosticLoggingClient.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = WebPageDiagnosticLoggingClient.cpp; sourceTree = "<group>"; };
> 		8372DB271A67562800C697C5 /* WebPageDiagnosticLoggingClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WebPageDiagnosticLoggingClient.h; sourceTree = "<group>"; };
> 		8372DB2E1A677D4A00C697C5 /* WKDiagnosticLoggingResultType.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WKDiagnosticLoggingResultType.h; sourceTree = "<group>"; };
>+		837A660020E2AD8400A9DBD8 /* ResourceLoadStatisticsMemoryStoreCocoa.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = ResourceLoadStatisticsMemoryStoreCocoa.mm; sourceTree = "<group>"; };
> 		83891B621A68B3420030F386 /* APIDiagnosticLoggingClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = APIDiagnosticLoggingClient.h; sourceTree = "<group>"; };
> 		83891B681A68BEBC0030F386 /* _WKDiagnosticLoggingDelegate.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = _WKDiagnosticLoggingDelegate.h; sourceTree = "<group>"; };
> 		83891B6A1A68C30B0030F386 /* DiagnosticLoggingClient.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = DiagnosticLoggingClient.h; sourceTree = "<group>"; };
>@@ -5543,6 +5547,7 @@
> 				CDA29A1E1CBEB5FB00901CCF /* PlaybackSessionManagerProxy.h */,
> 				CDA29A221CBEB61A00901CCF /* PlaybackSessionManagerProxy.messages.in */,
> 				CDA29A1F1CBEB5FB00901CCF /* PlaybackSessionManagerProxy.mm */,
>+				837A660020E2AD8400A9DBD8 /* ResourceLoadStatisticsMemoryStoreCocoa.mm */,
> 				1A002D47196B345D00B9AD44 /* SessionStateCoding.h */,
> 				1A002D46196B345D00B9AD44 /* SessionStateCoding.mm */,
> 				3157135C2040A9B20084F9CF /* SystemPreviewControllerCocoa.mm */,
>@@ -5560,7 +5565,6 @@
> 				7C4694CB1A4B510A00AD5845 /* WebPasteboardProxyCocoa.mm */,
> 				7CE4D2151A49148400C7F152 /* WebProcessPoolCocoa.mm */,
> 				1A04F6171A4A3A7A00A21B6E /* WebProcessProxyCocoa.mm */,
>-				7AAD175E1EA6AF37003B0894 /* WebResourceLoadStatisticsStoreCocoa.mm */,
> 				51D124311E6DE521002B2820 /* WebURLSchemeHandlerCocoa.h */,
> 				51D124321E6DE521002B2820 /* WebURLSchemeHandlerCocoa.mm */,
> 				2DFC7DB91BCCC19500C1548C /* WebViewImpl.h */,
>@@ -7313,6 +7317,8 @@
> 				A55BA81B1BA25B1E007CD33D /* RemoteWebInspectorProxy.cpp */,
> 				A55BA8191BA25B1E007CD33D /* RemoteWebInspectorProxy.h */,
> 				A55BA81A1BA25B1E007CD33D /* RemoteWebInspectorProxy.messages.in */,
>+				83681DCB20E2904B00C249CD /* ResourceLoadStatisticsMemoryStore.cpp */,
>+				83681DCA20E2904A00C249CD /* ResourceLoadStatisticsMemoryStore.h */,
> 				51E6C1621F2935CD00FD3437 /* ResourceLoadStatisticsPersistentStorage.cpp */,
> 				51E6C1611F2935CD00FD3437 /* ResourceLoadStatisticsPersistentStorage.h */,
> 				BC111B08112F5E3C00337BAB /* ResponsivenessTimer.cpp */,
>@@ -9200,6 +9206,7 @@
> 				A55BA8171BA23E12007CD33D /* RemoteWebInspectorUI.h in Headers */,
> 				6BE969CD1E54E054008B7483 /* ResourceLoadStatisticsClassifier.h in Headers */,
> 				6BE969CB1E54D4CF008B7483 /* ResourceLoadStatisticsClassifierCocoa.h in Headers */,
>+				83B3CB1020E2AB0100441E9B /* ResourceLoadStatisticsMemoryStore.h in Headers */,
> 				51E6C1641F2935DD00FD3437 /* ResourceLoadStatisticsPersistentStorage.h in Headers */,
> 				1A30066E1110F4F70031937C /* ResponsivenessTimer.h in Headers */,
> 				410482CE1DDD324F00F006D0 /* RTCNetwork.h in Headers */,
>@@ -10975,6 +10982,8 @@
> 				1BBBE4A019B66C53006B7D81 /* RemoteWebInspectorUIMessageReceiver.cpp in Sources */,
> 				6BE969C71E54D4B6008B7483 /* ResourceLoadStatisticsClassifier.cpp in Sources */,
> 				6BE969CA1E54D4CF008B7483 /* ResourceLoadStatisticsClassifierCocoa.cpp in Sources */,
>+				83B3CB0F20E2AAFE00441E9B /* ResourceLoadStatisticsMemoryStore.cpp in Sources */,
>+				837A660120E2AD8500A9DBD8 /* ResourceLoadStatisticsMemoryStoreCocoa.mm in Sources */,
> 				51E6C1631F2935D800FD3437 /* ResourceLoadStatisticsPersistentStorage.cpp in Sources */,
> 				51E6C1601F29356000FD3437 /* ResourceLoadStatisticsPersistentStorageIOS.mm in Sources */,
> 				BC111B09112F5E3C00337BAB /* ResponsivenessTimer.cpp in Sources */,
>@@ -11288,7 +11297,6 @@
> 				510AFFB916542048001BA05E /* WebResourceLoader.cpp in Sources */,
> 				51F060E11654318500F3281B /* WebResourceLoaderMessageReceiver.cpp in Sources */,
> 				7A791EFC1C7D08C500C4C52B /* WebResourceLoadStatisticsStore.cpp in Sources */,
>-				7AAD175F1EA6AF99003B0894 /* WebResourceLoadStatisticsStoreCocoa.mm in Sources */,
> 				7A791EFA1C7CFCF100C4C52B /* WebResourceLoadStatisticsStoreMessageReceiver.cpp in Sources */,
> 				6B821DDD1EEF05DD00D7AF4A /* WebResourceLoadStatisticsTelemetry.cpp in Sources */,
> 				413075AF1DE85F580039EC69 /* WebRTCMonitor.cpp in Sources */,

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Attachments on bug 187055: 343632 | 343646 | 343672 | 343687 | 343717 | 343811