Attachment 340376 Details for Bug 185487 – Patch for landing

[patch] Patch for landing

bug-185487-20180514163953.patch (text/plain), 44.08 KB, created by Jer Noble on 2018-05-14 16:40:04 PDT

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Creator: Jer Noble

Created: 2018-05-14 16:40:04 PDT

Size: 44.08 KB

patch

obsolete

>Subversion Revision: 231761
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 51ffd24a2b3b7424c366a19305db2f47bf667444..d0d3fa4de04047d0d8fe0f9c17e7c368f5695ddc 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,82 @@
>+2018-05-09  Jer Noble  <jer.noble@apple.com>
>+
>+        Media continues loading after rendered invisible (removed from DOM; scrolled off screen)
>+        https://bugs.webkit.org/show_bug.cgi?id=185487
>+
>+        Reviewed by Eric Carlson.
>+
>+        Test: media/video-buffering-allowed.html
>+
>+        When a media element is removed from the dom (e.g. through innerHTML=""), it doesn't
>+        necessarily stop loading media data; it will continue to do so until its destructor is
>+        called through garbage collection. Similarly, when a media element is rendered not-visible
>+        by being scrolled off-screen or being made display:none, media loading continues. There
>+        are legitimate use cases for out-of-DOM media loading, so only temporarily block loading
>+        when the element transitions out of the document. Similarly, only block loading for non-visible
>+        media elements when returning from the "page is hidden" state, and only until the media
>+        element is asked to play or is otherwise made visible.
>+
>+        Note: this refactors a lot of code out of PlatformMediaSession and into MediaElementSession,
>+        since this code is specific to "media elements".
>+
>+        * html/HTMLMediaElement.cpp:
>+        (WebCore::HTMLMediaElement::HTMLMediaElement):
>+        (WebCore::HTMLMediaElement::insertedIntoAncestor):
>+        (WebCore::HTMLMediaElement::removedFromAncestor):
>+        (WebCore::HTMLMediaElement::playInternal):
>+        (WebCore::HTMLMediaElement::stopWithoutDestroyingMediaPlayer):
>+        (WebCore::HTMLMediaElement::resume):
>+        (WebCore::HTMLMediaElement::visibilityStateChanged):
>+        (WebCore::HTMLMediaElement::createMediaPlayer):
>+        (WebCore::HTMLMediaElement::setShouldBufferData):
>+        (WebCore::HTMLMediaElement::purgeBufferedDataIfPossible):
>+        (WebCore::HTMLMediaElement::isVisibleInViewportChanged):
>+        (WebCore::HTMLMediaElement::fullscreenModeChanged):
>+        (WebCore::HTMLMediaElement::setInActiveDocument):
>+        * html/HTMLMediaElement.h:
>+        (WebCore::HTMLMediaElement::shouldBufferData const):
>+        (WebCore::HTMLMediaElement::elementIsHidden const):
>+        * html/MediaElementSession.cpp:
>+        (WebCore::MediaElementSession::MediaElementSession):
>+        (WebCore::MediaElementSession::clientWillBeginAutoplaying):
>+        (WebCore::MediaElementSession::clientWillBeginPlayback):
>+        (WebCore::MediaElementSession::clientWillPausePlayback):
>+        (WebCore::MediaElementSession::visibilityChanged):
>+        (WebCore::MediaElementSession::isVisibleInViewportChanged):
>+        (WebCore::MediaElementSession::inActiveDocumentChanged):
>+        (WebCore::MediaElementSession::scheduleClientDataBufferingCheck):
>+        (WebCore::MediaElementSession::clientDataBufferingTimerFired):
>+        (WebCore::MediaElementSession::updateClientDataBuffering):
>+        (WebCore::MediaElementSession::dataBufferingPermitted const):
>+        (WebCore::MediaElementSession::wantsToObserveViewportVisibilityForAutoplay const):
>+        * html/MediaElementSession.h:
>+        * platform/audio/PlatformMediaSession.cpp:
>+        (WebCore::PlatformMediaSession::PlatformMediaSession):
>+        (WebCore::PlatformMediaSession::clientWillBeginAutoplaying):
>+        (WebCore::PlatformMediaSession::clientWillBeginPlayback):
>+        (WebCore::PlatformMediaSession::clientWillPausePlayback):
>+        (): Deleted.
>+        (WebCore::PlatformMediaSession::visibilityChanged): Deleted.
>+        (WebCore::PlatformMediaSession::scheduleClientDataBufferingCheck): Deleted.
>+        (WebCore::PlatformMediaSession::clientDataBufferingTimerFired): Deleted.
>+        (WebCore::PlatformMediaSession::updateClientDataBuffering): Deleted.
>+        (WebCore::PlatformMediaSession::isHidden const): Deleted.
>+        * platform/audio/PlatformMediaSession.h:
>+        (WebCore::PlatformMediaSessionClient::setShouldBufferData): Deleted.
>+        (WebCore::PlatformMediaSessionClient::elementIsHidden const): Deleted.
>+        * platform/audio/PlatformMediaSessionManager.cpp:
>+        (WebCore::PlatformMediaSessionManager::sessionCanLoadMedia const): Deleted.
>+        * platform/audio/PlatformMediaSessionManager.h:
>+        * platform/audio/ios/MediaSessionManagerIOS.h:
>+        * platform/audio/ios/MediaSessionManagerIOS.mm:
>+        (WebCore::MediaSessionManageriOS::sessionCanLoadMedia const): Deleted.
>+        * rendering/RenderVideo.cpp:
>+        (WebCore::RenderVideo::willBeDestroyed):
>+        * testing/Internals.cpp:
>+        (WebCore::Internals::elementShouldBufferData):
>+        * testing/Internals.h:
>+        * testing/Internals.idl:
>+
> 2018-05-14  Thibault Saunier  <tsaunier@igalia.com>
> 
>         [GStreamer] Fix style issue in MediaPlayerPrivateGStreamerBase
>diff --git a/Source/WebCore/html/HTMLMediaElement.cpp b/Source/WebCore/html/HTMLMediaElement.cpp
>index 96cf8b9b14a0e91fb480e2ce303d3682c03efa2b..7b9fa0809ab02e8ab9657b049e3d640274b1861f 100644
>--- a/Source/WebCore/html/HTMLMediaElement.cpp
>+++ b/Source/WebCore/html/HTMLMediaElement.cpp
>@@ -477,6 +477,7 @@ HTMLMediaElement::HTMLMediaElement(const QualifiedName& tagName, Document& docum
>     , m_completelyLoaded(false)
>     , m_havePreparedToPlay(false)
>     , m_parsingInProgress(createdByParser)
>+    , m_shouldBufferData(true)
>     , m_elementIsHidden(document.hidden())
>     , m_creatingControls(false)
>     , m_receivedLayoutSizeChanged(false)
>@@ -926,7 +927,7 @@ Node::InsertedIntoAncestorResult HTMLMediaElement::insertedIntoAncestor(Insertio
> 
>     HTMLElement::insertedIntoAncestor(insertionType, parentOfInsertedTree);
>     if (insertionType.connectedToDocument)
>-        m_inActiveDocument = true;
>+        setInActiveDocument(true);
> 
>     return InsertedIntoAncestorResult::NeedsPostInsertionCallback;
> }
>@@ -978,7 +979,7 @@ void HTMLMediaElement::removedFromAncestor(RemovalType removalType, ContainerNod
> {
>     INFO_LOG(LOGIDENTIFIER);
> 
>-    m_inActiveDocument = false;
>+    setInActiveDocument(false);
>     if (removalType.disconnectedFromDocument) {
>         // Pause asynchronously to let the operation that removed us finish, in case we get inserted back into a document.
>         m_pauseAfterDetachedTaskQueue.enqueueTask(std::bind(&HTMLMediaElement::pauseAfterDetachedTask, this));
>@@ -3467,7 +3468,7 @@ void HTMLMediaElement::playInternal()
>         ALWAYS_LOG(LOGIDENTIFIER, "  returning because of interruption");
>         return;
>     }
>-
>+    
>     // 4.8.10.9. Playing the media resource
>     if (!m_player || m_networkState == NETWORK_EMPTY)
>         selectMediaResource();
>@@ -5520,7 +5521,7 @@ void HTMLMediaElement::stopWithoutDestroyingMediaPlayer()
>     setPreparedToReturnVideoLayerToInline(true);
> 
>     updatePlaybackControlsManager();
>-    m_inActiveDocument = false;
>+    setInActiveDocument(false);
> 
>     // Stop the playback without generating events
>     setPlaying(false);
>@@ -5600,7 +5601,7 @@ void HTMLMediaElement::resume()
> {
>     INFO_LOG(LOGIDENTIFIER);
> 
>-    m_inActiveDocument = true;
>+    setInActiveDocument(true);
> 
>     m_asyncEventQueue.resume();
> 
>@@ -5638,8 +5639,13 @@ void HTMLMediaElement::mediaVolumeDidChange()
> 
> void HTMLMediaElement::visibilityStateChanged()
> {
>-    m_elementIsHidden = document().hidden() && m_videoFullscreenMode != VideoFullscreenModePictureInPicture;
>+    bool elementIsHidden = document().hidden() && m_videoFullscreenMode != VideoFullscreenModePictureInPicture;
>+    if (elementIsHidden == m_elementIsHidden)
>+        return;
>+
>+    m_elementIsHidden = elementIsHidden;
>     INFO_LOG(LOGIDENTIFIER, "visible = ", !m_elementIsHidden);
>+
>     updateSleepDisabling();
>     m_mediaSession->visibilityChanged();
>     if (m_player)
>@@ -6499,6 +6505,7 @@ void HTMLMediaElement::createMediaPlayer()
>     forgetResourceSpecificTracks();
> #endif
>     m_player = MediaPlayer::create(*this);
>+    m_player->setShouldBufferData(m_shouldBufferData);
>     scheduleUpdatePlaybackControlsManager();
> 
> #if ENABLE(WEB_AUDIO)
>@@ -7660,6 +7667,10 @@ bool HTMLMediaElement::doesHaveAttribute(const AtomicString& attribute, AtomicSt
> 
> void HTMLMediaElement::setShouldBufferData(bool shouldBuffer)
> {
>+    if (shouldBuffer == m_shouldBufferData)
>+        return;
>+
>+    m_shouldBufferData = shouldBuffer;
>     if (m_player)
>         m_player->setShouldBufferData(shouldBuffer);
> }
>@@ -7667,7 +7678,7 @@ void HTMLMediaElement::setShouldBufferData(bool shouldBuffer)
> void HTMLMediaElement::purgeBufferedDataIfPossible()
> {
> #if PLATFORM(IOS)
>-    if (!MemoryPressureHandler::singleton().isUnderMemoryPressure() && PlatformMediaSessionManager::sharedManager().sessionCanLoadMedia(*m_mediaSession))
>+    if (!MemoryPressureHandler::singleton().isUnderMemoryPressure() && m_mediaSession->dataBufferingPermitted())
>         return;
> 
>     if (m_isPlayingToWirelessTarget) {
>@@ -7775,6 +7786,7 @@ bool HTMLMediaElement::isVideoTooSmallForInlinePlayback()
> void HTMLMediaElement::isVisibleInViewportChanged()
> {
>     m_visibilityChangeTaskQueue.enqueueTask([this] {
>+        m_mediaSession->isVisibleInViewportChanged();
>         updateShouldAutoplay();
>         scheduleUpdatePlaybackControlsManager();
>     });
>@@ -7874,7 +7886,6 @@ void HTMLMediaElement::fullscreenModeChanged(VideoFullscreenMode mode)
> 
>     m_videoFullscreenMode = mode;
>     visibilityStateChanged();
>-    m_mediaSession->scheduleClientDataBufferingCheck();
>     scheduleUpdatePlaybackControlsManager();
> }
> 
>@@ -7907,6 +7918,15 @@ void HTMLMediaElement::applicationDidBecomeActive()
>         m_player->applicationDidBecomeActive();
> }
> 
>+void HTMLMediaElement::setInActiveDocument(bool inActiveDocument)
>+{
>+    if (inActiveDocument == m_inActiveDocument)
>+        return;
>+
>+    m_inActiveDocument = inActiveDocument;
>+    m_mediaSession->inActiveDocumentChanged();
>+}
>+
> }
> 
> #endif
>diff --git a/Source/WebCore/html/HTMLMediaElement.h b/Source/WebCore/html/HTMLMediaElement.h
>index 79f1af0359234295be34e87c6211ec391ffa534f..c8b94b5e1a671a1bdfac8e4bab469ba62ade6138 100644
>--- a/Source/WebCore/html/HTMLMediaElement.h
>+++ b/Source/WebCore/html/HTMLMediaElement.h
>@@ -265,7 +265,8 @@ public:
> 
>     WEBCORE_EXPORT void play() override;
>     WEBCORE_EXPORT void pause() override;
>-    void setShouldBufferData(bool) override;
>+    void setShouldBufferData(bool);
>+    WEBCORE_EXPORT bool shouldBufferData() const { return m_shouldBufferData; }
>     WEBCORE_EXPORT void fastSeek(double);
>     double minFastReverseRate() const;
>     double maxFastForwardRate() const;
>@@ -277,7 +278,7 @@ public:
>     WEBCORE_EXPORT bool webkitClosedCaptionsVisible() const;
>     WEBCORE_EXPORT void setWebkitClosedCaptionsVisible(bool);
> 
>-    bool elementIsHidden() const override { return m_elementIsHidden; }
>+    bool elementIsHidden() const { return m_elementIsHidden; }
> 
> #if ENABLE(MEDIA_STATISTICS)
> // Statistics
>@@ -912,6 +913,8 @@ private:
>     void applicationWillResignActive() final;
>     void applicationDidBecomeActive() final;
> 
>+    void setInActiveDocument(bool);
>+
> #if !RELEASE_LOG_DISABLED
>     const char* logClassName() const final { return "HTMLMediaElement"; }
> 
>@@ -1064,7 +1067,9 @@ private:
>     bool m_completelyLoaded : 1;
>     bool m_havePreparedToPlay : 1;
>     bool m_parsingInProgress : 1;
>+    bool m_shouldBufferData : 1;
>     bool m_elementIsHidden : 1;
>+    bool m_elementWasRemovedFromDOM : 1;
>     bool m_creatingControls : 1;
>     bool m_receivedLayoutSizeChanged : 1;
>     bool m_hasEverNotifiedAboutPlaying : 1;
>diff --git a/Source/WebCore/html/MediaElementSession.cpp b/Source/WebCore/html/MediaElementSession.cpp
>index 34b3e86c2fc2327a730e541a1247bb4b5310c839..c2bd79a6d1613e46ed6f04664280cc950290ea99 100644
>--- a/Source/WebCore/html/MediaElementSession.cpp
>+++ b/Source/WebCore/html/MediaElementSession.cpp
>@@ -56,6 +56,7 @@
> 
> namespace WebCore {
> 
>+static const Seconds clientDataBufferingTimerThrottleDelay { 100_ms };
> static const Seconds elementMainContentCheckInterval { 250_ms };
> 
> static bool isElementRectMostlyInMainFrame(const HTMLMediaElement&);
>@@ -109,6 +110,7 @@ MediaElementSession::MediaElementSession(HTMLMediaElement& element)
>     , m_targetAvailabilityChangedTimer(*this, &MediaElementSession::targetAvailabilityChangedTimerFired)
> #endif
>     , m_mainContentCheckTimer(*this, &MediaElementSession::mainContentCheckTimerFired)
>+    , m_clientDataBufferingTimer(*this, &MediaElementSession::clientDataBufferingTimerFired)
> #if !RELEASE_LOG_DISABLED
>     , m_logIdentifier(element.logIdentifier())
> #endif
>@@ -133,6 +135,86 @@ void MediaElementSession::unregisterWithDocument(Document& document)
> #endif
> }
> 
>+void MediaElementSession::clientWillBeginAutoplaying()
>+{
>+    PlatformMediaSession::clientWillBeginAutoplaying();
>+    m_elementIsHiddenBecauseItWasRemovedFromDOM = false;
>+    updateClientDataBuffering();
>+}
>+
>+bool MediaElementSession::clientWillBeginPlayback()
>+{
>+    if (!PlatformMediaSession::clientWillBeginPlayback())
>+        return false;
>+
>+    m_elementIsHiddenBecauseItWasRemovedFromDOM = false;
>+    updateClientDataBuffering();
>+    return true;
>+}
>+
>+bool MediaElementSession::clientWillPausePlayback()
>+{
>+    if (!PlatformMediaSession::clientWillPausePlayback())
>+        return false;
>+
>+    updateClientDataBuffering();
>+    return true;
>+}
>+
>+void MediaElementSession::visibilityChanged()
>+{
>+    scheduleClientDataBufferingCheck();
>+
>+    if (m_element.elementIsHidden() && !m_element.isFullscreen())
>+        m_elementIsHiddenUntilVisibleInViewport = true;
>+}
>+
>+void MediaElementSession::isVisibleInViewportChanged()
>+{
>+    scheduleClientDataBufferingCheck();
>+
>+    if (m_element.isFullscreen() || m_element.isVisibleInViewport())
>+        m_elementIsHiddenUntilVisibleInViewport = false;
>+}
>+
>+void MediaElementSession::inActiveDocumentChanged()
>+{
>+    m_elementIsHiddenBecauseItWasRemovedFromDOM = !m_element.inActiveDocument();
>+    scheduleClientDataBufferingCheck();
>+}
>+
>+void MediaElementSession::scheduleClientDataBufferingCheck()
>+{
>+    if (!m_clientDataBufferingTimer.isActive())
>+        m_clientDataBufferingTimer.startOneShot(clientDataBufferingTimerThrottleDelay);
>+}
>+
>+void MediaElementSession::clientDataBufferingTimerFired()
>+{
>+    INFO_LOG(LOGIDENTIFIER, "visible = ", m_element.elementIsHidden());
>+
>+    updateClientDataBuffering();
>+
>+#if PLATFORM(IOS)
>+    PlatformMediaSessionManager::sharedManager().configureWireLessTargetMonitoring();
>+#endif
>+
>+    if (state() != Playing || !m_element.elementIsHidden())
>+        return;
>+
>+    PlatformMediaSessionManager::SessionRestrictions restrictions = PlatformMediaSessionManager::sharedManager().restrictions(mediaType());
>+    if ((restrictions & PlatformMediaSessionManager::BackgroundTabPlaybackRestricted) == PlatformMediaSessionManager::BackgroundTabPlaybackRestricted)
>+        pauseSession();
>+}
>+
>+void MediaElementSession::updateClientDataBuffering()
>+{
>+    if (m_clientDataBufferingTimer.isActive())
>+        m_clientDataBufferingTimer.stop();
>+
>+    m_element.setShouldBufferData(dataBufferingPermitted());
>+}
>+
> void MediaElementSession::addBehaviorRestriction(BehaviorRestrictions restrictions)
> {
>     if (restrictions & ~m_restrictions)
>@@ -275,6 +357,23 @@ bool MediaElementSession::dataLoadingPermitted() const
>     return true;
> }
> 
>+bool MediaElementSession::dataBufferingPermitted() const
>+{
>+    if (isSuspended())
>+        return false;
>+
>+    if (state() == PlatformMediaSession::Playing)
>+        return true;
>+
>+    if (shouldOverrideBackgroundLoadingRestriction())
>+        return true;
>+
>+    if (m_elementIsHiddenUntilVisibleInViewport || m_elementIsHiddenBecauseItWasRemovedFromDOM || m_element.elementIsHidden())
>+        return false;
>+
>+    return true;
>+}
>+
> bool MediaElementSession::fullscreenPermitted() const
> {
>     if (m_restrictions & RequireUserGestureForFullscreen && !m_element.document().processingUserGestureForMedia()) {
>@@ -418,9 +517,7 @@ bool MediaElementSession::wantsToObserveViewportVisibilityForMediaControls() con
> 
> bool MediaElementSession::wantsToObserveViewportVisibilityForAutoplay() const
> {
>-    if (!m_element.isVideo())
>-        return false;
>-    return hasBehaviorRestriction(InvisibleAutoplayNotPermitted) || hasBehaviorRestriction(OverrideUserGestureRequirementForMainContent);
>+    return m_element.isVideo();
> }
> 
> #if ENABLE(WIRELESS_PLAYBACK_TARGET)
>@@ -674,7 +771,7 @@ bool MediaElementSession::allowsPictureInPicture() const
> #if PLATFORM(IOS)
> bool MediaElementSession::requiresPlaybackTargetRouteMonitoring() const
> {
>-    return m_hasPlaybackTargetAvailabilityListeners && !client().elementIsHidden();
>+    return m_hasPlaybackTargetAvailabilityListeners && !m_element.elementIsHidden();
> }
> #endif
> 
>diff --git a/Source/WebCore/html/MediaElementSession.h b/Source/WebCore/html/MediaElementSession.h
>index 8289ffa3fb52f572881d1a846d2f5a6070898774..3e1f0854167c4f9e16fd3f0b4d128fda7224e678 100644
>--- a/Source/WebCore/html/MediaElementSession.h
>+++ b/Source/WebCore/html/MediaElementSession.h
>@@ -61,9 +61,18 @@ public:
>     void registerWithDocument(Document&);
>     void unregisterWithDocument(Document&);
> 
>+    void clientWillBeginAutoplaying() final;
>+    bool clientWillBeginPlayback() final;
>+    bool clientWillPausePlayback() final;
>+
>+    void visibilityChanged();
>+    void isVisibleInViewportChanged();
>+    void inActiveDocumentChanged();
>+
>     SuccessOr<MediaPlaybackDenialReason> playbackPermitted() const;
>     bool autoplayPermitted() const;
>     bool dataLoadingPermitted() const;
>+    bool dataBufferingPermitted() const;
>     bool fullscreenPermitted() const;
>     bool pageAllowsDataLoading() const;
>     bool pageAllowsPlaybackAfterResuming() const;
>@@ -165,9 +174,16 @@ private:
>     bool updateIsMainContent() const;
>     void mainContentCheckTimerFired();
> 
>+    void scheduleClientDataBufferingCheck();
>+    void clientDataBufferingTimerFired();
>+    void updateClientDataBuffering();
>+
>     HTMLMediaElement& m_element;
>     BehaviorRestrictions m_restrictions;
> 
>+    bool m_elementIsHiddenUntilVisibleInViewport { false };
>+    bool m_elementIsHiddenBecauseItWasRemovedFromDOM { false };
>+
> #if ENABLE(WIRELESS_PLAYBACK_TARGET)
>     mutable Timer m_targetAvailabilityChangedTimer;
>     RefPtr<MediaPlaybackTarget> m_playbackTarget;
>@@ -182,6 +198,7 @@ private:
> 
>     mutable bool m_isMainContent { false };
>     Timer m_mainContentCheckTimer;
>+    Timer m_clientDataBufferingTimer;
> 
> #if !RELEASE_LOG_DISABLED
>     const void* m_logIdentifier;
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSession.cpp b/Source/WebCore/platform/audio/PlatformMediaSession.cpp
>index f2e19827b4655a9217f629e131981527467987d4..1de86e50aea19eb5368cf8f1e019329537082228 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSession.cpp
>+++ b/Source/WebCore/platform/audio/PlatformMediaSession.cpp
>@@ -93,7 +93,6 @@ std::unique_ptr<PlatformMediaSession> PlatformMediaSession::create(PlatformMedia
> 
> PlatformMediaSession::PlatformMediaSession(PlatformMediaSessionClient& client)
>     : m_client(client)
>-    , m_clientDataBufferingTimer(*this, &PlatformMediaSession::clientDataBufferingTimerFired)
>     , m_state(Idle)
>     , m_stateToRestore(Idle)
>     , m_notifyingClient(false)
>@@ -176,7 +175,6 @@ void PlatformMediaSession::clientWillBeginAutoplaying()
>     }
> 
>     setState(Autoplaying);
>-    updateClientDataBuffering();
> }
> 
> bool PlatformMediaSession::clientWillBeginPlayback()
>@@ -191,7 +189,6 @@ bool PlatformMediaSession::clientWillBeginPlayback()
>     }
> 
>     setState(Playing);
>-    updateClientDataBuffering();
>     return true;
> }
> 
>@@ -209,7 +206,6 @@ bool PlatformMediaSession::clientWillPausePlayback()
>     
>     setState(Paused);
>     PlatformMediaSessionManager::sharedManager().sessionWillEndPlayback(*this);
>-    scheduleClientDataBufferingCheck();
>     return true;
> }
> 
>@@ -273,53 +269,11 @@ bool PlatformMediaSession::supportsSeeking() const
>     return m_client.supportsSeeking();
> }
> 
>-void PlatformMediaSession::visibilityChanged()
>-{
>-    scheduleClientDataBufferingCheck();
>-}
>-
>-void PlatformMediaSession::scheduleClientDataBufferingCheck()
>-{
>-    if (!m_clientDataBufferingTimer.isActive())
>-        m_clientDataBufferingTimer.startOneShot(clientDataBufferingTimerThrottleDelay);
>-}
>-
>-void PlatformMediaSession::clientDataBufferingTimerFired()
>-{
>-    INFO_LOG(LOGIDENTIFIER, "visible = ", m_client.elementIsHidden());
>-
>-    updateClientDataBuffering();
>-
>-#if PLATFORM(IOS)
>-    PlatformMediaSessionManager::sharedManager().configureWireLessTargetMonitoring();
>-#endif
>-
>-    if (m_state != Playing || !m_client.elementIsHidden())
>-        return;
>-
>-    PlatformMediaSessionManager::SessionRestrictions restrictions = PlatformMediaSessionManager::sharedManager().restrictions(mediaType());
>-    if ((restrictions & PlatformMediaSessionManager::BackgroundTabPlaybackRestricted) == PlatformMediaSessionManager::BackgroundTabPlaybackRestricted)
>-        pauseSession();
>-}
>-
>-void PlatformMediaSession::updateClientDataBuffering()
>-{
>-    if (m_clientDataBufferingTimer.isActive())
>-        m_clientDataBufferingTimer.stop();
>-
>-    m_client.setShouldBufferData(PlatformMediaSessionManager::sharedManager().sessionCanLoadMedia(*this));
>-}
>-
> String PlatformMediaSession::sourceApplicationIdentifier() const
> {
>     return m_client.sourceApplicationIdentifier();
> }
> 
>-bool PlatformMediaSession::isHidden() const
>-{
>-    return m_client.elementIsHidden();
>-}
>-
> bool PlatformMediaSession::isSuspended() const
> {
>     return m_client.isSuspended();
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSession.h b/Source/WebCore/platform/audio/PlatformMediaSession.h
>index 838e34737bdce7d4e389b82092531bc84604eb0e..037ff04dfa4126f5309008a4dc9ae3d8254779c1 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSession.h
>+++ b/Source/WebCore/platform/audio/PlatformMediaSession.h
>@@ -105,15 +105,13 @@ public:
>     void beginInterruption(InterruptionType);
>     void endInterruption(EndInterruptionFlags);
> 
>-    void clientWillBeginAutoplaying();
>-    bool clientWillBeginPlayback();
>-    bool clientWillPausePlayback();
>+    virtual void clientWillBeginAutoplaying();
>+    virtual bool clientWillBeginPlayback();
>+    virtual bool clientWillPausePlayback();
> 
>     void pauseSession();
>     void stopSession();
>     
>-    void visibilityChanged();
>-
> #if ENABLE(VIDEO)
>     String title() const;
>     double duration() const;
>@@ -171,7 +169,6 @@ public:
>     bool canProduceAudio() const;
>     void canProduceAudioChanged();
> 
>-    void scheduleClientDataBufferingCheck();
>     virtual void resetPlaybackSessionState() { }
>     String sourceApplicationIdentifier() const;
> 
>@@ -188,11 +185,7 @@ protected:
> #endif
> 
> private:
>-    void clientDataBufferingTimerFired();
>-    void updateClientDataBuffering();
>-
>     PlatformMediaSessionClient& m_client;
>-    Timer m_clientDataBufferingTimer;
>     State m_state;
>     State m_stateToRestore;
>     InterruptionType m_interruptionType { NoInterruption };
>@@ -232,8 +225,6 @@ public:
>     virtual void didReceiveRemoteControlCommand(PlatformMediaSession::RemoteControlCommandType, const PlatformMediaSession::RemoteCommandArgument*) = 0;
>     virtual bool supportsSeeking() const = 0;
> 
>-    virtual void setShouldBufferData(bool) { }
>-    virtual bool elementIsHidden() const { return false; }
>     virtual bool canProduceAudio() const { return false; }
>     virtual bool isSuspended() const { return false; };
> 
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp b/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>index 806a3a5a63a141a2af841aa6dff510e49bfd4e95..3277b1a088377ea193459a86403946bcc98cefcd 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>+++ b/Source/WebCore/platform/audio/PlatformMediaSessionManager.cpp
>@@ -287,13 +287,6 @@ Vector<PlatformMediaSession*> PlatformMediaSessionManager::currentSessionsMatchi
>     return matchingSessions;
> }
>     
>-bool PlatformMediaSessionManager::sessionCanLoadMedia(const PlatformMediaSession& session) const
>-{
>-    if (session.isSuspended())
>-        return false;
>-    return session.state() == PlatformMediaSession::Playing || !session.isHidden() || session.shouldOverrideBackgroundLoadingRestriction();
>-}
>-
> void PlatformMediaSessionManager::applicationWillBecomeInactive() const
> {
>     LOG(Media, "PlatformMediaSessionManager::applicationWillBecomeInactive");
>diff --git a/Source/WebCore/platform/audio/PlatformMediaSessionManager.h b/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>index 8a434d630ff964b1de06adaa37406594ccab2e37..9897e6a5ffadb8d16173d861e6eb36af040614f3 100644
>--- a/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>+++ b/Source/WebCore/platform/audio/PlatformMediaSessionManager.h
>@@ -94,7 +94,6 @@ public:
> 
>     virtual bool sessionWillBeginPlayback(PlatformMediaSession&);
>     virtual void sessionWillEndPlayback(PlatformMediaSession&);
>-    virtual bool sessionCanLoadMedia(const PlatformMediaSession&) const;
>     virtual void sessionDidEndRemoteScrubbing(const PlatformMediaSession&) { };
>     virtual void clientCharacteristicsChanged(PlatformMediaSession&) { }
> 
>diff --git a/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.h b/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.h
>index eb70dc2584bcad89c963da82632beaf101de42ff..ee193f4f5275065418a9844aa6dcb2510186a45d 100644
>--- a/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.h
>+++ b/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.h
>@@ -65,8 +65,6 @@ private:
> 
>     void configureWireLessTargetMonitoring() override;
> 
>-    bool sessionCanLoadMedia(const PlatformMediaSession&) const override;
>-
>     bool hasActiveNowPlayingSession() const final { return m_nowPlayingActive; }
>     String lastUpdatedNowPlayingTitle() const final { return m_reportedTitle; }
>     double lastUpdatedNowPlayingDuration() const final { return m_reportedDuration; }
>diff --git a/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.mm b/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.mm
>index c8f435f49a2ce22f7b7c6d4052576e104a5b48da..8b0bb34eb62bdf95e8af648b1d2a75ff1dcbc7ca 100644
>--- a/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.mm
>+++ b/Source/WebCore/platform/audio/ios/MediaSessionManagerIOS.mm
>@@ -301,14 +301,6 @@ void MediaSessionManageriOS::updateNowPlayingInfo()
> #endif // HAVE(MEDIA_PLAYER)
> }
> 
>-bool MediaSessionManageriOS::sessionCanLoadMedia(const PlatformMediaSession& session) const
>-{
>-    if (session.displayType() == PlatformMediaSession::Optimized)
>-        return true;
>-
>-    return PlatformMediaSessionManager::sessionCanLoadMedia(session);
>-}
>-
> void MediaSessionManageriOS::externalOutputDeviceAvailableDidChange()
> {
>     BEGIN_BLOCK_OBJC_EXCEPTIONS
>diff --git a/Source/WebCore/rendering/RenderVideo.cpp b/Source/WebCore/rendering/RenderVideo.cpp
>index 0289205b5eee11059d6cb7fe7628275daa1fd71b..681b4cb851be0394b8224c33813c0a7bcbd114ca 100644
>--- a/Source/WebCore/rendering/RenderVideo.cpp
>+++ b/Source/WebCore/rendering/RenderVideo.cpp
>@@ -64,6 +64,7 @@ RenderVideo::~RenderVideo()
> 
> void RenderVideo::willBeDestroyed()
> {
>+    visibleInViewportStateChanged();
>     if (auto player = videoElement().player())
>         player->setVisible(false);
> 
>diff --git a/Source/WebCore/testing/Internals.cpp b/Source/WebCore/testing/Internals.cpp
>index 81a4009533f9cdf19b263f862513ba82b9335b40..0fd7d4e7bc8d00a83aa291f3f817bf1adb9fb4f2 100644
>--- a/Source/WebCore/testing/Internals.cpp
>+++ b/Source/WebCore/testing/Internals.cpp
>@@ -3223,6 +3223,11 @@ void Internals::endSimulatedHDCPError(HTMLMediaElement& element)
>         player->endSimulatedHDCPError();
> }
> 
>+bool Internals::elementShouldBufferData(HTMLMediaElement& element)
>+{
>+    return element.shouldBufferData();
>+}
>+
> #endif
> 
> bool Internals::isSelectPopupVisible(HTMLSelectElement& element)
>diff --git a/Source/WebCore/testing/Internals.h b/Source/WebCore/testing/Internals.h
>index 1b83bcb18de773c5f34a5060572d4985ab9df2c1..6036ee9fe29d487bd1f91782f9586736436a3ed1 100644
>--- a/Source/WebCore/testing/Internals.h
>+++ b/Source/WebCore/testing/Internals.h
>@@ -470,6 +470,8 @@ public:
>     ExceptionOr<bool> mediaElementHasCharacteristic(HTMLMediaElement&, const String&);
>     void beginSimulatedHDCPError(HTMLMediaElement&);
>     void endSimulatedHDCPError(HTMLMediaElement&);
>+
>+    bool elementShouldBufferData(HTMLMediaElement&);
> #endif
> 
>     bool isSelectPopupVisible(HTMLSelectElement&);
>diff --git a/Source/WebCore/testing/Internals.idl b/Source/WebCore/testing/Internals.idl
>index 8d9c267cdde0d465dbff7734e92b660c478fc388..25c0d1cc47757a104ab748a4bb949a524fa8bc38 100644
>--- a/Source/WebCore/testing/Internals.idl
>+++ b/Source/WebCore/testing/Internals.idl
>@@ -426,6 +426,8 @@ enum EventThrottlingBehavior {
>     [Conditional=VIDEO] void beginSimulatedHDCPError(HTMLMediaElement media);
>     [Conditional=VIDEO] void endSimulatedHDCPError(HTMLMediaElement media);
> 
>+    [Conditional=VIDEO] boolean elementShouldBufferData(HTMLMediaElement media);
>+
>     [Conditional=LEGACY_ENCRYPTED_MEDIA] void initializeMockCDM();
>     [Conditional=ENCRYPTED_MEDIA] MockCDMFactory registerMockCDM();
> 
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index 2a066b03d1c1fcb39a063e9b7597af7a0598d911..ad759f19e3bb5e1cb05d1d650d978e1fdeef70a5 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,18 @@
>+2018-05-09  Jer Noble  <jer.noble@apple.com>
>+
>+        Media continues loading after rendered invisible (removed from DOM; scrolled off screen)
>+        https://bugs.webkit.org/show_bug.cgi?id=185487
>+
>+        Reviewed by Eric Carlson.
>+
>+        * media/video-buffering-allowed-expected.txt: Added.
>+        * media/video-buffering-allowed.html: Added.
>+        * media/video-test.js:
>+        (compare):
>+        (testExpected):
>+        (sleepFor):
>+        (testArraysEqual): Deleted.
>+
> 2018-05-14  Youenn Fablet  <youenn@apple.com>
> 
>         Enable service-worker/navigation-redirect-body.https.html and service-worker/postmessage.https.html
>diff --git a/LayoutTests/media/media-source/only-bcp47-language-tags-accepted-as-valid-expected.txt b/LayoutTests/media/media-source/only-bcp47-language-tags-accepted-as-valid-expected.txt
>index a11aa4a4178bc0583b301a26c943d80428b0e45b..54a6e483b89457ab2e2e3ce76a5003a821078181 100644
>--- a/LayoutTests/media/media-source/only-bcp47-language-tags-accepted-as-valid-expected.txt
>+++ b/LayoutTests/media/media-source/only-bcp47-language-tags-accepted-as-valid-expected.txt
>@@ -1,48 +1,48 @@
>-CONSOLE MESSAGE: line 176: The language 'a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '1' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language '1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'ab-abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'ab-abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'ab-abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'ab-abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '1a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'ab-abcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghijabcdefghij' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '1a' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language '1a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '1a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '-a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '1a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '-a' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language '-a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language '-a' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'a-' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language '-a' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a-' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'a-' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'a-' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'a1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a-' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a1' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'a1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'a1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aa1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'a1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aa1' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'aa1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aa1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aaaa' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aa1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aaaa' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'aaaa' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aaaa' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aaa1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aaaa' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aaa1' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'aaa1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'aaa1' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char space' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'aaa1' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char space' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'inv-alid-char space' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char space' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-charÃ¢â¬âlongDash' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char space' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-charÃ¢â¬âlongDash' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'inv-alid-charÃ¢â¬âlongDash' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-charÃ¢â¬âlongDash' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-PÃÂ¥lska' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-charÃ¢â¬âlongDash' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-PÃÂ¥lska' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'inv-alid-char-PÃÂ¥lska' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-PÃÂ¥lska' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-*' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-PÃÂ¥lska' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-*' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'inv-alid-char-*' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-*' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-Ã¯Â£Â¿' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-*' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-Ã¯Â£Â¿' is not a valid BCP 47 language tag.
> CONSOLE MESSAGE: line 106: The language 'inv-alid-char-Ã¯Â£Â¿' is not a valid BCP 47 language tag.
>-CONSOLE MESSAGE: line 176: The language 'inv-alid-char-Ã¯Â£Â¿' is not a valid BCP 47 language tag.
>+CONSOLE MESSAGE: line 221: The language 'inv-alid-char-Ã¯Â£Â¿' is not a valid BCP 47 language tag.
> Test that only BCP47 language tags are accepted as valid but still reflected.
> 
> 
>diff --git a/LayoutTests/media/video-buffering-allowed-expected.txt b/LayoutTests/media/video-buffering-allowed-expected.txt
>new file mode 100644
>index 0000000000000000000000000000000000000000..1da49de6842019d181314144d24044b86f767f8d
>--- /dev/null
>+++ b/LayoutTests/media/video-buffering-allowed-expected.txt
>@@ -0,0 +1,32 @@
>+
>+RUN(video.src = findMediaFile("video", "content/test"))
>+EVENT(canplaythrough)
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+* Remove the video element from the document.
>+RUN(video.parentNode.removeChild(video))
>+EXPECTED (internals.elementShouldBufferData(video) == 'false') OK
>+* Play the video.
>+RUN(video.play())
>+EVENT(playing)
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+* Pause the video.
>+RUN(video.pause())
>+EVENT(pause)
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+* Re-insert the video element into the document.
>+RUN(document.body.insertBefore(video, document.body.firstChild))
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+* display:none the video element.
>+RUN(video.style.display = "none")
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+* Simulate the view becoming invisible.
>+RUN(internals.setPageVisibility(false))
>+EXPECTED (internals.elementShouldBufferData(video) == 'false') OK
>+* Simulate the view becoming visible.
>+RUN(internals.setPageVisibility(true))
>+EXPECTED (internals.elementShouldBufferData(video) == 'false') OK
>+* Remove display:none from the video element.
>+RUN(video.style.removeProperty("display"))
>+EXPECTED (internals.elementShouldBufferData(video) == 'true') OK
>+END OF TEST
>+
>diff --git a/LayoutTests/media/video-buffering-allowed.html b/LayoutTests/media/video-buffering-allowed.html
>new file mode 100644
>index 0000000000000000000000000000000000000000..6fbbe15bc71188236746855b050e2d7f759c3a58
>--- /dev/null
>+++ b/LayoutTests/media/video-buffering-allowed.html
>@@ -0,0 +1,58 @@
>+<!DOCTYPE html>
>+<html>
>+<head>
>+    <title>video-buffering-allowed</title>
>+    <script src=media-file.js></script>
>+    <script src=video-test.js></script>
>+    <script>
>+        async function runTest() {
>+            findMediaElement();
>+            failTestIn(1000);
>+
>+            run('video.src = findMediaFile("video", "content/test")');
>+            await waitFor(video, 'canplaythrough');
>+            testExpected('internals.elementShouldBufferData(video)', true);
>+
>+            consoleWrite('* Remove the video element from the document.');
>+            run('video.parentNode.removeChild(video)');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', false);
>+
>+            consoleWrite('* Play the video.');
>+            run ('video.play()');
>+            await waitFor(video, 'playing');
>+            testExpected('internals.elementShouldBufferData(video)', true);
>+
>+            consoleWrite('* Pause the video.');
>+            run('video.pause()');
>+            await waitFor(video, 'pause');
>+            testExpected('internals.elementShouldBufferData(video)', true);
>+
>+            consoleWrite('* Re-insert the video element into the document.');
>+            run('document.body.insertBefore(video, document.body.firstChild)');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', true);
>+
>+            consoleWrite('* display:none the video element.');
>+            run('video.style.display = "none"');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', true);
>+
>+            consoleWrite('* Simulate the view becoming invisible.');
>+            run('internals.setPageVisibility(false)');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', false);
>+
>+            consoleWrite('* Simulate the view becoming visible.');
>+            run('internals.setPageVisibility(true)');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', false);
>+
>+            consoleWrite('* Remove display:none from the video element.');
>+            run('video.style.removeProperty("display")');
>+            await testExpectedEventually('internals.elementShouldBufferData(video)', true);
>+
>+            endTest();
>+        }
>+        window.addEventListener('load', runTest);
>+    </script>
>+</head>
>+<body>
>+    <video controls></video>
>+</body>
>+</html>
>diff --git a/LayoutTests/media/video-test.js b/LayoutTests/media/video-test.js
>index d4b463c6e8987c23e2f0046e5106ea639660ee83..6eb110f8fe16f1cfc5b2eb63f348f64aa6271c9a 100644
>--- a/LayoutTests/media/video-test.js
>+++ b/LayoutTests/media/video-test.js
>@@ -62,17 +62,9 @@ function test(testFuncString, endit)
>         endTest();
> }
> 
>-function testExpected(testFuncString, expected, comparison)
>+function compare(testFuncString, expected, comparison)
> {
>-    try {
>-        var observed = eval(testFuncString);
>-    } catch (ex) {
>-        consoleWrite(ex);
>-        return;
>-    }
>-
>-    if (comparison === undefined)
>-        comparison = '==';
>+    var observed = eval(testFuncString);
> 
>     var success = false;
>     switch (comparison)
>@@ -87,7 +79,51 @@ function testExpected(testFuncString, expected, comparison)
>         case 'instanceof': success = observed instanceof expected; break;
>     }
> 
>-    reportExpected(success, testFuncString, comparison, expected, observed)
>+    return {success:success, observed:observed};
>+}
>+
>+function testExpected(testFuncString, expected, comparison)
>+{
>+    if (comparison === undefined)
>+        comparison = '==';
>+
>+    try {
>+        let {success, observed} = compare(testFuncString, expected, comparison);
>+        reportExpected(success, testFuncString, comparison, expected, observed)
>+    } catch (ex) {
>+        consoleWrite(ex);
>+    }
>+}
>+
>+function sleepFor(duration) {
>+    return new Promise(resolve => {
>+        setTimeout(resolve, duration);
>+    });
>+}
>+
>+function testExpectedEventually(testFuncString, expected, comparison)
>+{
>+    return new Promise(async resolve => {
>+        var success;
>+        var observed;
>+        if (comparison === undefined)
>+            comparison = '==';
>+        while (true) {
>+            try {
>+                let {success, observed} = compare(testFuncString, expected, comparison);
>+                if (success) {
>+                    reportExpected(success, testFuncString, comparison, expected, observed);
>+                    resolve();
>+                    return;
>+                }
>+                await sleepFor(1);
>+            } catch (ex) {
>+                consoleWrite(ex);
>+                resolve();
>+                return;
>+            }
>+        }
>+    });
> }
> 
> function testArraysEqual(testFuncString, expected)
>@@ -150,6 +186,15 @@ function run(testFuncString)
>     }
> }
> 
>+function waitFor(element, event) {
>+    return new Promise(resolve => {
>+        element.addEventListener(event, event => {
>+            consoleWrite(`EVENT(${event.type})`);
>+            resolve(event);
>+        }, { once: true });
>+    });
>+}
>+
> function waitForEventOnce(eventName, func, endit)
> {
>     waitForEvent(eventName, func, endit, true)

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Attachments on bug 185487: 340016 | 340027 | 340036 | 340045 | 340326 | 340332 | 340347 | 340376