Attachment 341649 Details for Bug 186130 – Patch

[patch] Patch

bug-186130-20180531011655.patch (text/plain), 44.67 KB, created by Tim Horton on 2018-05-31 01:16:56 PDT

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Creator: Tim Horton

Created: 2018-05-31 01:16:56 PDT

Size: 44.67 KB

patch

obsolete

>Subversion Revision: 232209
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 79085998915e70e282ddc1aba0472e2efd69c423..75492586deb5ac39b155352bb0c81f2981b09946 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,50 @@
>+2018-05-31  Tim Horton  <timothy_horton@apple.com>
>+
>+        Move animated resize into the layer tree transaction, and make it asynchronous
>+        https://bugs.webkit.org/show_bug.cgi?id=186130
>+        <rdar://problem/38477288>
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h:
>+        (WebKit::RemoteLayerTreeTransaction::setScrollPosition):
>+        (WebKit::RemoteLayerTreeTransaction::dynamicViewportSizeUpdateID const):
>+        (WebKit::RemoteLayerTreeTransaction::setDynamicViewportSizeUpdateID):
>+        * Shared/RemoteLayerTree/RemoteLayerTreeTransaction.mm:
>+        (WebKit::RemoteLayerTreeTransaction::encode const):
>+        (WebKit::RemoteLayerTreeTransaction::decode):
>+        * UIProcess/API/Cocoa/WKWebView.mm:
>+        (-[WKWebView _processDidExit]):
>+        (-[WKWebView _didCommitLayerTreeDuringAnimatedResize:]):
>+        (-[WKWebView _didCommitLayerTree:]):
>+        (activeMaximumUnobscuredSize):
>+        (activeOrientation):
>+        (-[WKWebView _didCompleteAnimatedResize]):
>+        (-[WKWebView _beginAnimatedResizeWithUpdates:]):
>+        (-[WKWebView _endAnimatedResize]):
>+        (-[WKWebView _dynamicViewportUpdateChangedTargetToScale:position:nextValidLayerTreeTransactionID:]): Deleted.
>+        * UIProcess/API/Cocoa/WKWebViewInternal.h:
>+        * UIProcess/PageClient.h:
>+        * UIProcess/WebPageProxy.cpp:
>+        (WebKit::WebPageProxy::resetState):
>+        * UIProcess/WebPageProxy.h:
>+        * UIProcess/WebPageProxy.messages.in:
>+        * UIProcess/ios/PageClientImplIOS.h:
>+        * UIProcess/ios/PageClientImplIOS.mm:
>+        (WebKit::PageClientImpl::dynamicViewportUpdateChangedTarget): Deleted.
>+        * UIProcess/ios/WebPageProxyIOS.mm:
>+        (WebKit::WebPageProxy::dynamicViewportSizeUpdate):
>+        (WebKit::WebPageProxy::didCommitLayerTree):
>+        (WebKit::WebPageProxy::synchronizeDynamicViewportUpdate): Deleted.
>+        (WebKit::WebPageProxy::dynamicViewportUpdateChangedTarget): Deleted.
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::willCommitLayerTree):
>+        * WebProcess/WebPage/WebPage.h:
>+        * WebProcess/WebPage/WebPage.messages.in:
>+        * WebProcess/WebPage/ios/WebPageIOS.mm:
>+        (WebKit::WebPage::dynamicViewportSizeUpdate):
>+        (WebKit::WebPage::synchronizeDynamicViewportUpdate): Deleted.
>+
> 2018-05-25  Tim Horton  <timothy_horton@apple.com>
> 
>         Ensure that the Web Content process doesn't sleep during initialization
>diff --git a/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h b/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h
>index f156c23354955db7c1b2650b0f0bba3c01d7b336..0cba87113c093f0dab6227e4f84498e927829529 100644
>--- a/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h
>+++ b/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.h
>@@ -218,10 +218,8 @@ public:
>     WebCore::Color pageExtendedBackgroundColor() const { return m_pageExtendedBackgroundColor; }
>     void setPageExtendedBackgroundColor(WebCore::Color color) { m_pageExtendedBackgroundColor = color; }
> 
>-#if PLATFORM(MAC)
>     WebCore::IntPoint scrollPosition() const { return m_scrollPosition; }
>     void setScrollPosition(WebCore::IntPoint p) { m_scrollPosition = p; }
>-#endif
> 
>     double pageScaleFactor() const { return m_pageScaleFactor; }
>     void setPageScaleFactor(double pageScaleFactor) { m_pageScaleFactor = pageScaleFactor; }
>@@ -272,6 +270,9 @@ public:
>     bool hasEditorState() const { return !!m_editorState; }
>     const EditorState& editorState() const { return m_editorState.value(); }
>     void setEditorState(const EditorState& editorState) { m_editorState = editorState; }
>+
>+    std::optional<uint64_t> dynamicViewportSizeUpdateID() const { return m_dynamicViewportSizeUpdateID; }
>+    void setDynamicViewportSizeUpdateID(uint64_t resizeID) { m_dynamicViewportSizeUpdateID = resizeID; }
>     
> private:
>     WebCore::GraphicsLayer::PlatformLayerID m_rootLayerID;
>@@ -290,9 +291,7 @@ private:
>     WebCore::LayoutSize m_baseLayoutViewportSize;
>     WebCore::LayoutPoint m_minStableLayoutViewportOrigin;
>     WebCore::LayoutPoint m_maxStableLayoutViewportOrigin;
>-#if PLATFORM(MAC)
>     WebCore::IntPoint m_scrollPosition;
>-#endif
>     WebCore::Color m_pageExtendedBackgroundColor;
>     double m_pageScaleFactor { 1 };
>     double m_minimumScaleFactor { 1 };
>@@ -310,6 +309,7 @@ private:
>     bool m_isInStableState { false };
> 
>     std::optional<EditorState> m_editorState { std::nullopt };
>+    std::optional<uint64_t> m_dynamicViewportSizeUpdateID { std::nullopt };
> };
> 
> } // namespace WebKit
>diff --git a/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.mm b/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.mm
>index caf72df3d15577ead420d28e0ae155c3d028001e..c2517ffb932fb99f143591c4f291a2ac0e92dbc0 100644
>--- a/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.mm
>+++ b/Source/WebKit/Shared/RemoteLayerTree/RemoteLayerTreeTransaction.mm
>@@ -533,9 +533,8 @@ void RemoteLayerTreeTransaction::encode(IPC::Encoder& encoder) const
>     encoder << m_minStableLayoutViewportOrigin;
>     encoder << m_maxStableLayoutViewportOrigin;
> 
>-#if PLATFORM(MAC)
>     encoder << m_scrollPosition;
>-#endif
>+
>     encoder << m_pageExtendedBackgroundColor;
>     encoder << m_pageScaleFactor;
>     encoder << m_minimumScaleFactor;
>@@ -563,6 +562,8 @@ void RemoteLayerTreeTransaction::encode(IPC::Encoder& encoder) const
>     encoder << hasEditorState();
>     if (m_editorState)
>         encoder << *m_editorState;
>+
>+    encoder << m_dynamicViewportSizeUpdateID;
> }
> 
> bool RemoteLayerTreeTransaction::decode(IPC::Decoder& decoder, RemoteLayerTreeTransaction& result)
>@@ -624,11 +625,9 @@ bool RemoteLayerTreeTransaction::decode(IPC::Decoder& decoder, RemoteLayerTreeTr
> 
>     if (!decoder.decode(result.m_maxStableLayoutViewportOrigin))
>         return false;
>-    
>-#if PLATFORM(MAC)
>+
>     if (!decoder.decode(result.m_scrollPosition))
>         return false;
>-#endif
>     
>     if (!decoder.decode(result.m_pageExtendedBackgroundColor))
>         return false;
>@@ -692,6 +691,9 @@ bool RemoteLayerTreeTransaction::decode(IPC::Decoder& decoder, RemoteLayerTreeTr
>         result.setEditorState(editorState);
>     }
> 
>+    if (!decoder.decode(result.m_dynamicViewportSizeUpdateID))
>+        return false;
>+
>     return true;
> }
> 
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>index e988f9a9aa6240c395febc40961663a76abbe1e3..b5f2f7f45b41a94056a9e2cd405d50f7241bf1d4 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebView.mm
>@@ -312,8 +312,8 @@ @implementation WKWebView {
>     BOOL _needsResetViewStateAfterCommitLoadForMainFrame;
>     uint64_t _firstPaintAfterCommitLoadTransactionID;
>     DynamicViewportUpdateMode _dynamicViewportUpdateMode;
>+    uint64_t _currentDynamicViewportSizeUpdateID;
>     CATransform3D _resizeAnimationTransformAdjustments;
>-    std::optional<uint64_t> _resizeAnimationTransformTransactionID;
>     RetainPtr<UIView> _resizeAnimationView;
>     CGFloat _lastAdjustmentForScroller;
>     std::optional<CGRect> _frozenVisibleContentRect;
>@@ -348,6 +348,8 @@ @implementation WKWebView {
>     BOOL _hadDelayedUpdateVisibleContentRects;
> 
>     int _activeAnimatedResizeCount;
>+    BOOL _waitingForEndAnimatedResize;
>+    BOOL _waitingForCommitAfterAnimatedResize;
> 
>     Vector<WTF::Function<void ()>> _snapshotsDeferredDuringResize;
>     RetainPtr<NSMutableArray> _stableStatePresentationUpdateCallbacks;
>@@ -357,15 +359,13 @@ @implementation WKWebView {
>     BOOL _hasScheduledVisibleRectUpdate;
>     BOOL _visibleContentRectUpdateScheduledFromScrollViewInStableState;
>     Vector<BlockPtr<void ()>> _visibleContentRectUpdateCallbacks;
>+
>+    _WKDragInteractionPolicy _dragInteractionPolicy;
> #endif
> #if PLATFORM(MAC)
>     std::unique_ptr<WebKit::WebViewImpl> _impl;
>     RetainPtr<WKTextFinderClient> _textFinderClient;
> #endif
>-
>-#if PLATFORM(IOS)
>-    _WKDragInteractionPolicy _dragInteractionPolicy;
>-#endif
> }
> 
> - (instancetype)initWithFrame:(CGRect)frame
>@@ -1700,7 +1700,6 @@ - (void)_processDidExit
> 
>     _firstPaintAfterCommitLoadTransactionID = 0;
>     _firstTransactionIDAfterPageRestore = std::nullopt;
>-    _resizeAnimationTransformTransactionID = std::nullopt;
> 
>     _hasScheduledVisibleRectUpdate = NO;
>     _commitDidRestoreScrollPosition = NO;
>@@ -1756,6 +1755,46 @@ static inline bool areEssentiallyEqualAsFloat(float a, float b)
>     return WTF::areEssentiallyEqual(a, b);
> }
> 
>+- (void)_didCommitLayerTreeDuringAnimatedResize:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
>+{
>+    auto updateID = layerTreeTransaction.dynamicViewportSizeUpdateID();
>+    if (updateID && *updateID == _currentDynamicViewportSizeUpdateID) {
>+        double pageScale = layerTreeTransaction.pageScaleFactor();
>+        WebCore::IntPoint scrollPosition = layerTreeTransaction.scrollPosition();
>+
>+        CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
>+        double currentTargetScale = animatingScaleTarget * [[_contentView layer] transform].m11;
>+        double scale = pageScale / currentTargetScale;
>+        _resizeAnimationTransformAdjustments = CATransform3DMakeScale(scale, scale, 1);
>+
>+        CGPoint newContentOffset = [self _contentOffsetAdjustedForObscuredInset:CGPointMake(scrollPosition.x() * pageScale, scrollPosition.y() * pageScale)];
>+        CGPoint currentContentOffset = [_scrollView contentOffset];
>+
>+        _resizeAnimationTransformAdjustments.m41 = (currentContentOffset.x - newContentOffset.x) / animatingScaleTarget;
>+        _resizeAnimationTransformAdjustments.m42 = (currentContentOffset.y - newContentOffset.y) / animatingScaleTarget;
>+
>+        [_resizeAnimationView layer].sublayerTransform = _resizeAnimationTransformAdjustments;
>+
>+        // If we've already passed endAnimatedResize, immediately complete
>+        // the resize when we have an up-to-date layer tree. Otherwise,
>+        // we will defer completion until endAnimatedResize.
>+        _waitingForCommitAfterAnimatedResize = NO;
>+        if (!_waitingForEndAnimatedResize)
>+            [self _didCompleteAnimatedResize];
>+
>+        return;
>+    }
>+
>+    // If a commit arrives during a resize but before the layer tree takes the current
>+    // resize into account, it could change the WKContentView's size. Update the
>+    // resizeAnimationView's scale to ensure we continue to fill the width of the resize target.
>+    CGFloat visibleContentViewWidthInContentCoordinates = std::min<CGFloat>([_contentView bounds].size.width, _page->unobscuredContentRect().width());
>+    auto newViewLayoutSize = [self activeViewLayoutSize:self.bounds];
>+    CGFloat targetScale = newViewLayoutSize.width() / visibleContentViewWidthInContentCoordinates;
>+    CGFloat resizeAnimationViewScale = targetScale / contentZoomScale(self);
>+    [_resizeAnimationView setTransform:CGAffineTransformMakeScale(resizeAnimationViewScale, resizeAnimationViewScale)];
>+}
>+
> - (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction
> {
>     if (![self usesStandardContentView])
>@@ -1766,14 +1805,7 @@ - (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTree
>     bool needUpdateVisibleContentRects = _page->updateLayoutViewportParameters(layerTreeTransaction);
> 
>     if (_dynamicViewportUpdateMode != DynamicViewportUpdateMode::NotResizing) {
>-        if (_resizeAnimationTransformTransactionID && layerTreeTransaction.transactionID() >= _resizeAnimationTransformTransactionID.value()) {
>-            _resizeAnimationTransformTransactionID = std::nullopt;
>-            [_resizeAnimationView layer].sublayerTransform = _resizeAnimationTransformAdjustments;
>-            if (_dynamicViewportUpdateMode == DynamicViewportUpdateMode::ResizingWithDocumentHidden) {
>-                [_contentView setHidden:NO];
>-                [self _endAnimatedResize];
>-            }
>-        }
>+        [self _didCommitLayerTreeDuringAnimatedResize:layerTreeTransaction];
>         return;
>     }
> 
>@@ -1873,25 +1905,6 @@ - (void)_layerTreeCommitComplete
>     _commitDidRestoreScrollPosition = NO;
> }
> 
>-- (void)_dynamicViewportUpdateChangedTargetToScale:(double)newScale position:(CGPoint)newScrollPosition nextValidLayerTreeTransactionID:(uint64_t)nextValidLayerTreeTransactionID
>-{
>-    LOG_WITH_STREAM(VisibleRects, stream << "-[WKWebView " << _page->pageID() << " _dynamicViewportUpdateChangedTargetToScale:] " <<  newScale << " _dynamicViewportUpdateMode " << (int)_dynamicViewportUpdateMode);
>-
>-    if (_dynamicViewportUpdateMode != DynamicViewportUpdateMode::NotResizing) {
>-        CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
>-        double currentTargetScale = animatingScaleTarget * [[_contentView layer] transform].m11;
>-        double scale = newScale / currentTargetScale;
>-        _resizeAnimationTransformAdjustments = CATransform3DMakeScale(scale, scale, 1);
>-
>-        CGPoint newContentOffset = [self _contentOffsetAdjustedForObscuredInset:CGPointMake(newScrollPosition.x * newScale, newScrollPosition.y * newScale)];
>-        CGPoint currentContentOffset = [_scrollView contentOffset];
>-
>-        _resizeAnimationTransformAdjustments.m41 = (currentContentOffset.x - newContentOffset.x) / animatingScaleTarget;
>-        _resizeAnimationTransformAdjustments.m42 = (currentContentOffset.y - newContentOffset.y) / animatingScaleTarget;
>-        _resizeAnimationTransformTransactionID = nextValidLayerTreeTransactionID;
>-    }
>-}
>-
> - (void)_couldNotRestorePageState
> {
>     // The gestureController may be waiting for the scroll position to be restored
>@@ -2831,6 +2844,82 @@ - (void)_updateVisibleContentRects
>     }
> }
> 
>+static WebCore::FloatSize activeMaximumUnobscuredSize(WKWebView *webView, const CGRect& bounds)
>+{
>+    return WebCore::FloatSize(webView->_overridesMaximumUnobscuredSize ? webView->_maximumUnobscuredSizeOverride : bounds.size);
>+}
>+
>+static int32_t activeOrientation(WKWebView *webView)
>+{
>+    return webView->_overridesInterfaceOrientation ? deviceOrientationForUIInterfaceOrientation(webView->_interfaceOrientationOverride) : webView->_page->deviceOrientation();
>+}
>+
>+- (void)_didCompleteAnimatedResize
>+{
>+    if (_dynamicViewportUpdateMode == DynamicViewportUpdateMode::NotResizing)
>+        return;
>+
>+    [_contentView setHidden:NO];
>+
>+    if (!_resizeAnimationView) {
>+        // Paranoia. If _resizeAnimationView is null we'll end up setting a zero scale on the content view.
>+        RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _endAnimatedResize:] - _resizeAnimationView is nil", self);
>+        _dynamicViewportUpdateMode = DynamicViewportUpdateMode::NotResizing;
>+        return;
>+    }
>+
>+    --_activeAnimatedResizeCount;
>+    NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
>+    [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
>+    [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
>+
>+    CALayer *contentLayer = [_contentView layer];
>+    CGFloat adjustmentScale = _resizeAnimationTransformAdjustments.m11;
>+    contentLayer.sublayerTransform = CATransform3DIdentity;
>+
>+    CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
>+    CATransform3D contentLayerTransform = contentLayer.transform;
>+    CGFloat currentScale = [[_resizeAnimationView layer] transform].m11 * contentLayerTransform.m11;
>+
>+    // We cannot use [UIScrollView setZoomScale:] directly because the UIScrollView delegate would get a callback with
>+    // an invalid contentOffset. The real content offset is only set below.
>+    // Since there is no public API for setting both the zoomScale and the contentOffset, we set the zoomScale manually
>+    // on the zoom layer and then only change the contentOffset.
>+    CGFloat adjustedScale = adjustmentScale * currentScale;
>+    contentLayerTransform.m11 = adjustedScale;
>+    contentLayerTransform.m22 = adjustedScale;
>+    contentLayer.transform = contentLayerTransform;
>+
>+    CGPoint currentScrollOffset = [_scrollView contentOffset];
>+    double horizontalScrollAdjustement = _resizeAnimationTransformAdjustments.m41 * animatingScaleTarget;
>+    double verticalScrollAdjustment = _resizeAnimationTransformAdjustments.m42 * animatingScaleTarget;
>+
>+    [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
>+    [_scrollView setContentOffset:CGPointMake(currentScrollOffset.x - horizontalScrollAdjustement, currentScrollOffset.y - verticalScrollAdjustment)];
>+
>+    [_resizeAnimationView removeFromSuperview];
>+    _resizeAnimationView = nil;
>+    _resizeAnimationTransformAdjustments = CATransform3DIdentity;
>+
>+    _dynamicViewportUpdateMode = DynamicViewportUpdateMode::NotResizing;
>+    [self _scheduleVisibleContentRectUpdate];
>+
>+    CGRect newBounds = self.bounds;
>+    auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
>+    auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
>+    int32_t newOrientation = activeOrientation(self);
>+
>+    if (!_lastSentViewLayoutSize || newViewLayoutSize != _lastSentViewLayoutSize.value())
>+        [self _dispatchSetViewLayoutSize:newViewLayoutSize];
>+    if (!_lastSentMaximumUnobscuredSize || newMaximumUnobscuredSize != _lastSentMaximumUnobscuredSize.value())
>+        [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];
>+    if (!_lastSentDeviceOrientation || newOrientation != _lastSentDeviceOrientation.value())
>+        [self _dispatchSetDeviceOrientation:newOrientation];
>+
>+    while (!_snapshotsDeferredDuringResize.isEmpty())
>+        _snapshotsDeferredDuringResize.takeLast()();
>+}
>+
> - (void)_didFinishLoadForMainFrame
> {
>     if (_gestureController)
>@@ -4213,16 +4302,6 @@ - (void)_setShouldSuppressFirstResponderChanges:(BOOL)shouldSuppress
> #endif
> 
> #if PLATFORM(IOS)
>-static WebCore::FloatSize activeMaximumUnobscuredSize(WKWebView *webView, const CGRect& bounds)
>-{
>-    return WebCore::FloatSize(webView->_overridesMaximumUnobscuredSize ? webView->_maximumUnobscuredSizeOverride : bounds.size);
>-}
>-
>-static int32_t activeOrientation(WKWebView *webView)
>-{
>-    return webView->_overridesInterfaceOrientation ? deviceOrientationForUIInterfaceOrientation(webView->_interfaceOrientationOverride) : webView->_page->deviceOrientation();
>-}
>-
> - (void (^)(void))_retainActiveFocusedState
> {
>     ++_activeFocusedStateRetainCount;
>@@ -5198,12 +5277,14 @@ - (void)_beginAnimatedResizeWithUpdates:(void (^)(void))updateBlock
>     ++_activeAnimatedResizeCount;
>     _resizeAnimationTransformAdjustments = CATransform3DIdentity;
> 
>-    NSUInteger indexOfContentView = [[_scrollView subviews] indexOfObject:_contentView.get()];
>-    _resizeAnimationView = adoptNS([[UIView alloc] init]);
>-    [_resizeAnimationView layer].name = @"ResizeAnimation";
>-    [_scrollView insertSubview:_resizeAnimationView.get() atIndex:indexOfContentView];
>-    [_resizeAnimationView addSubview:_contentView.get()];
>-    [_resizeAnimationView addSubview:[_contentView unscaledView]];
>+    if (!_resizeAnimationView) {
>+        NSUInteger indexOfContentView = [[_scrollView subviews] indexOfObject:_contentView.get()];
>+        _resizeAnimationView = adoptNS([[UIView alloc] init]);
>+        [_resizeAnimationView layer].name = @"ResizeAnimation";
>+        [_scrollView insertSubview:_resizeAnimationView.get() atIndex:indexOfContentView];
>+        [_resizeAnimationView addSubview:_contentView.get()];
>+        [_resizeAnimationView addSubview:[_contentView unscaledView]];
>+    }
> 
>     CGSize contentSizeInContentViewCoordinates = contentViewBounds.size;
>     [_scrollView setMinimumZoomScale:std::min(newViewLayoutSize.width() / contentSizeInContentViewCoordinates.width, [_scrollView minimumZoomScale])];
>@@ -5240,7 +5321,7 @@ - (void)_beginAnimatedResizeWithUpdates:(void (^)(void))updateBlock
>     if (oldUnobscuredContentRect.maxY() > contentSizeInContentViewCoordinates.height - 1)
>         contentOffset.y = maxVerticalOffset;
>     if (oldUnobscuredContentRect.y() < 1)
>-        contentOffset.y = -_obscuredInsets.top;
>+        contentOffset.y = [self _initialContentOffsetForScrollView].y;
> 
>     // FIXME: if we have content centered after double tap to zoom, we should also try to keep that rect in view.
>     [_scrollView setContentSize:roundScrollViewContentSize(*_page, futureContentSizeInSelfCoordinates)];
>@@ -5256,9 +5337,12 @@ - (void)_beginAnimatedResizeWithUpdates:(void (^)(void))updateBlock
>     _lastSentMaximumUnobscuredSize = newMaximumUnobscuredSize;
>     _lastSentDeviceOrientation = newOrientation;
> 
>-    _page->dynamicViewportSizeUpdate(newViewLayoutSize, newMaximumUnobscuredSize, visibleRectInContentCoordinates, unobscuredRectInContentCoordinates, futureUnobscuredRectInSelfCoordinates, unobscuredSafeAreaInsetsExtent, targetScale, newOrientation);
>+    _page->dynamicViewportSizeUpdate(newViewLayoutSize, newMaximumUnobscuredSize, visibleRectInContentCoordinates, unobscuredRectInContentCoordinates, futureUnobscuredRectInSelfCoordinates, unobscuredSafeAreaInsetsExtent, targetScale, newOrientation, ++_currentDynamicViewportSizeUpdateID);
>     if (WebKit::DrawingAreaProxy* drawingArea = _page->drawingArea())
>         drawingArea->setSize(WebCore::IntSize(newBounds.size));
>+
>+    _waitingForCommitAfterAnimatedResize = YES;
>+    _waitingForEndAnimatedResize = YES;
> }
> 
> - (void)_endAnimatedResize
>@@ -5268,75 +5352,11 @@ - (void)_endAnimatedResize
>     if ([_customContentView respondsToSelector:@selector(web_endAnimatedResize)])
>         [_customContentView web_endAnimatedResize];
> 
>-    if (_dynamicViewportUpdateMode == DynamicViewportUpdateMode::NotResizing)
>-        return;
>-
>-    _page->synchronizeDynamicViewportUpdate();
>-
>-    // synchronizeDynamicViewportUpdate() may cause this function to re-enter via _didCommitLayerTree, so check _dynamicViewportUpdateMode again.
>-    if (_dynamicViewportUpdateMode == DynamicViewportUpdateMode::NotResizing)
>-        return;
>-
>-    if (!_resizeAnimationView) {
>-        // Paranoia. If _resizeAnimationView is null we'll end up setting a zero scale on the content view.
>-        RELEASE_LOG_IF_ALLOWED("%p -[WKWebView _endAnimatedResize:] - _resizeAnimationView is nil", self);
>-        _dynamicViewportUpdateMode = DynamicViewportUpdateMode::NotResizing;
>-        [_contentView setHidden:NO];
>-        return;
>-    }
>-
>-    --_activeAnimatedResizeCount;
>-    NSUInteger indexOfResizeAnimationView = [[_scrollView subviews] indexOfObject:_resizeAnimationView.get()];
>-    [_scrollView insertSubview:_contentView.get() atIndex:indexOfResizeAnimationView];
>-    [_scrollView insertSubview:[_contentView unscaledView] atIndex:indexOfResizeAnimationView + 1];
>-
>-    CALayer *contentViewLayer = [_contentView layer];
>-    CGFloat adjustmentScale = _resizeAnimationTransformAdjustments.m11;
>-    contentViewLayer.sublayerTransform = CATransform3DIdentity;
>-
>-    CGFloat animatingScaleTarget = [[_resizeAnimationView layer] transform].m11;
>-    CALayer *contentLayer = [_contentView layer];
>-    CATransform3D contentLayerTransform = contentLayer.transform;
>-    CGFloat currentScale = [[_resizeAnimationView layer] transform].m11 * contentLayerTransform.m11;
>-
>-    // We cannot use [UIScrollView setZoomScale:] directly because the UIScrollView delegate would get a callback with
>-    // an invalid contentOffset. The real content offset is only set below.
>-    // Since there is no public API for setting both the zoomScale and the contentOffset, we set the zoomScale manually
>-    // on the zoom layer and then only change the contentOffset.
>-    CGFloat adjustedScale = adjustmentScale * currentScale;
>-    contentLayerTransform.m11 = adjustedScale;
>-    contentLayerTransform.m22 = adjustedScale;
>-    contentLayer.transform = contentLayerTransform;
>-
>-    CGPoint currentScrollOffset = [_scrollView contentOffset];
>-    double horizontalScrollAdjustement = _resizeAnimationTransformAdjustments.m41 * animatingScaleTarget;
>-    double verticalScrollAdjustment = _resizeAnimationTransformAdjustments.m42 * animatingScaleTarget;
>-
>-    [_scrollView setContentSize:roundScrollViewContentSize(*_page, [_contentView frame].size)];
>-    [_scrollView setContentOffset:CGPointMake(currentScrollOffset.x - horizontalScrollAdjustement, currentScrollOffset.y - verticalScrollAdjustment)];
>-
>-    [_resizeAnimationView removeFromSuperview];
>-    _resizeAnimationView = nil;
>-    _resizeAnimationTransformAdjustments = CATransform3DIdentity;
>-
>-    _dynamicViewportUpdateMode = DynamicViewportUpdateMode::NotResizing;
>-    [_contentView setHidden:NO];
>-    [self _scheduleVisibleContentRectUpdate];
>-
>-    CGRect newBounds = self.bounds;
>-    auto newViewLayoutSize = [self activeViewLayoutSize:newBounds];
>-    auto newMaximumUnobscuredSize = activeMaximumUnobscuredSize(self, newBounds);
>-    int32_t newOrientation = activeOrientation(self);
>-
>-    if (!_lastSentViewLayoutSize || newViewLayoutSize != _lastSentViewLayoutSize.value())
>-        [self _dispatchSetViewLayoutSize:newViewLayoutSize];
>-    if (!_lastSentMaximumUnobscuredSize || newMaximumUnobscuredSize != _lastSentMaximumUnobscuredSize.value())
>-        [self _dispatchSetMaximumUnobscuredSize:WebCore::FloatSize(newMaximumUnobscuredSize)];
>-    if (!_lastSentDeviceOrientation || newOrientation != _lastSentDeviceOrientation.value())
>-        [self _dispatchSetDeviceOrientation:newOrientation];
>-
>-    while (!_snapshotsDeferredDuringResize.isEmpty())
>-        _snapshotsDeferredDuringResize.takeLast()();
>+    // If we already have an up-to-date layer tree, immediately complete
>+    // the resize. Otherwise, we will defer completion until we do.
>+    _waitingForEndAnimatedResize = NO;
>+    if (!_waitingForCommitAfterAnimatedResize)
>+        [self _didCompleteAnimatedResize];
> }
> 
> - (void)_resizeWhileHidingContentWithUpdates:(void (^)(void))updateBlock
>diff --git a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>index 1be7ffb0958a9edb766a207dda8e57eef3aaf568..a84d98de31bfc5c168076ff8640b233ce07a6aef 100644
>--- a/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>+++ b/Source/WebKit/UIProcess/API/Cocoa/WKWebViewInternal.h
>@@ -82,7 +82,6 @@ struct PrintInfo;
> - (void)_didCommitLayerTree:(const WebKit::RemoteLayerTreeTransaction&)layerTreeTransaction;
> - (void)_layerTreeCommitComplete;
> 
>-- (void)_dynamicViewportUpdateChangedTargetToScale:(double)newScale position:(CGPoint)newScrollPosition nextValidLayerTreeTransactionID:(uint64_t)nextValidLayerTreeTransactionID;
> - (void)_couldNotRestorePageState;
> - (void)_restorePageScrollPosition:(std::optional<WebCore::FloatPoint>)scrollPosition scrollOrigin:(WebCore::FloatPoint)scrollOrigin previousObscuredInset:(WebCore::FloatBoxExtent)insets scale:(double)scale;
> - (void)_restorePageStateToUnobscuredCenter:(std::optional<WebCore::FloatPoint>)center scale:(double)scale; // FIXME: needs scroll origin?
>@@ -105,6 +104,8 @@ struct PrintInfo;
> 
> - (void)_scheduleVisibleContentRectUpdate;
> 
>+- (void)_didCompleteAnimatedResize;
>+
> - (void)_didFinishLoadForMainFrame;
> - (void)_didFailLoadForMainFrame;
> - (void)_didSameDocumentNavigationForMainFrame:(WebKit::SameDocumentNavigationType)navigationType;
>diff --git a/Source/WebKit/UIProcess/PageClient.h b/Source/WebKit/UIProcess/PageClient.h
>index d7ef697d998a166697f11dc6f9e91e1c967e1819..b658fbb508d8543fe884c56b2f2aff6abdaf6535 100644
>--- a/Source/WebKit/UIProcess/PageClient.h
>+++ b/Source/WebKit/UIProcess/PageClient.h
>@@ -284,7 +284,6 @@ public:
>     virtual void didCommitLayerTree(const RemoteLayerTreeTransaction&) = 0;
>     virtual void layerTreeCommitComplete() = 0;
> 
>-    virtual void dynamicViewportUpdateChangedTarget(double newScale, const WebCore::FloatPoint& newScrollPosition, uint64_t transactionID) = 0;
>     virtual void couldNotRestorePageState() = 0;
>     virtual void restorePageState(std::optional<WebCore::FloatPoint> scrollPosition, const WebCore::FloatPoint& scrollOrigin, const WebCore::FloatBoxExtent& obscuredInsetsOnSave, double scale) = 0;
>     virtual void restorePageCenterAndScale(std::optional<WebCore::FloatPoint> center, double scale) = 0;
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
>index ea43629501c59f2b34f4fbb0be6b740120c08991..7c05045eeaca8f46bdb66af85bd1805fcc15acf4 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
>+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
>@@ -5938,9 +5938,6 @@ void WebPageProxy::resetState(ResetStateReason resetStateReason)
> #if PLATFORM(IOS)
>     m_firstLayerTreeTransactionIdAfterDidCommitLoad = 0;
>     m_lastVisibleContentRectUpdate = VisibleContentRectUpdateInfo();
>-    m_dynamicViewportSizeUpdateWaitingForTarget = false;
>-    m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit = false;
>-    m_dynamicViewportSizeUpdateLayerTreeTransactionID = 0;
>     m_hasNetworkRequestsOnSuspended = false;
>     m_isKeyboardAnimatingIn = false;
>     m_isScrollingOrZooming = false;
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.h b/Source/WebKit/UIProcess/WebPageProxy.h
>index 82e4e046241ee209f5d789c63d0eb783b4feb71c..8d524b193a6c96355e4efdc39a0151983845a13f 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.h
>+++ b/Source/WebKit/UIProcess/WebPageProxy.h
>@@ -550,8 +550,7 @@ public:
>     void overflowScrollWillStartScroll();
>     void overflowScrollDidEndScroll();
> 
>-    void dynamicViewportSizeUpdate(const WebCore::FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const WebCore::FloatRect& targetExposedContentRect, const WebCore::FloatRect& targetUnobscuredRect, const WebCore::FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& unobscuredSafeAreaInsets, double targetScale, int32_t deviceOrientation);
>-    void synchronizeDynamicViewportUpdate();
>+    void dynamicViewportSizeUpdate(const WebCore::FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const WebCore::FloatRect& targetExposedContentRect, const WebCore::FloatRect& targetUnobscuredRect, const WebCore::FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& unobscuredSafeAreaInsets, double targetScale, int32_t deviceOrientation, uint64_t dynamicViewportSizeUpdateID);
> 
>     void setViewportConfigurationViewLayoutSize(const WebCore::FloatSize&);
>     void setMaximumUnobscuredSize(const WebCore::FloatSize&);
>@@ -1662,7 +1661,6 @@ private:
>     WebCore::FloatSize overrideScreenSize();
>     float textAutosizingWidth();
> 
>-    void dynamicViewportUpdateChangedTarget(double newTargetScale, const WebCore::FloatPoint& newScrollPosition, uint64_t dynamicViewportSizeUpdateID);
>     void couldNotRestorePageState();
>     void restorePageState(std::optional<WebCore::FloatPoint> scrollPosition, const WebCore::FloatPoint& scrollOrigin, const WebCore::FloatBoxExtent& obscuredInsetsOnSave, double scale);
>     void restorePageCenterAndScale(std::optional<WebCore::FloatPoint>, double scale);
>@@ -1843,11 +1841,7 @@ private:
>     VisibleContentRectUpdateInfo m_lastVisibleContentRectUpdate;
>     uint64_t m_firstLayerTreeTransactionIdAfterDidCommitLoad { 0 };
>     int32_t m_deviceOrientation { 0 };
>-    uint64_t m_dynamicViewportSizeUpdateLayerTreeTransactionID { 0 };
>-    uint64_t m_currentDynamicViewportSizeUpdateID { 0 };
>     bool m_hasReceivedLayerTreeTransactionAfterDidCommitLoad { true };
>-    bool m_dynamicViewportSizeUpdateWaitingForTarget { false };
>-    bool m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit { false };
>     bool m_hasNetworkRequestsOnSuspended { false };
>     bool m_isKeyboardAnimatingIn { false };
>     bool m_isScrollingOrZooming { false };
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.messages.in b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>index e8b69cdf5df62c65fb85d42ad826456940c6ec6a..105f4cf4257a326b33c4e93561a8e593fa614e97 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.messages.in
>+++ b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>@@ -389,7 +389,6 @@ messages -> WebPageProxy {
> #endif
> 
> #if PLATFORM(IOS)
>-    DynamicViewportUpdateChangedTarget(double newTargetScale, WebCore::FloatPoint newScrollPosition, uint64_t dynamicViewportSizeUpdateID)
>     CouldNotRestorePageState()
>     RestorePageState(std::optional<WebCore::FloatPoint> scrollPosition, WebCore::FloatPoint scrollOrigin, WebCore::RectEdges<float> obscuredInsetsOnSave, double scale)
>     RestorePageCenterAndScale(std::optional<WebCore::FloatPoint> unobscuredCenter, double scale)
>diff --git a/Source/WebKit/UIProcess/ios/PageClientImplIOS.h b/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>index 9a7464ba8a47098a0205d1cd468ac0662d02ac5d..152ff301603d14d17d6fdca5c4d94db2c0805c1c 100644
>--- a/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>+++ b/Source/WebKit/UIProcess/ios/PageClientImplIOS.h
>@@ -120,7 +120,6 @@ private:
>     void didCommitLayerTree(const RemoteLayerTreeTransaction&) override;
>     void layerTreeCommitComplete() override;
> 
>-    void dynamicViewportUpdateChangedTarget(double newScale, const WebCore::FloatPoint& newScrollPosition, uint64_t transactionID) override;
>     void couldNotRestorePageState() override;
>     void restorePageState(std::optional<WebCore::FloatPoint>, const WebCore::FloatPoint&, const WebCore::FloatBoxExtent&, double) override;
>     void restorePageCenterAndScale(std::optional<WebCore::FloatPoint>, double) override;
>diff --git a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>index 6679a44bfe99d329818cb3e12031fe05a5dbc4b1..beef2183e4ae343e6d08ba3801ecd9838d270c3c 100644
>--- a/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>+++ b/Source/WebKit/UIProcess/ios/PageClientImplIOS.mm
>@@ -514,11 +514,6 @@ void PageClientImpl::layerTreeCommitComplete()
>     [m_contentView _layerTreeCommitComplete];
> }
> 
>-void PageClientImpl::dynamicViewportUpdateChangedTarget(double newScale, const WebCore::FloatPoint& newScrollPosition, uint64_t nextValidLayerTreeTransactionID)
>-{
>-    [m_webView _dynamicViewportUpdateChangedTargetToScale:newScale position:newScrollPosition nextValidLayerTreeTransactionID:nextValidLayerTreeTransactionID];
>-}
>-
> void PageClientImpl::couldNotRestorePageState()
> {
>     [m_webView _couldNotRestorePageState];
>diff --git a/Source/WebKit/UIProcess/ios/WebPageProxyIOS.mm b/Source/WebKit/UIProcess/ios/WebPageProxyIOS.mm
>index 93732367b15404b1aeb7a4c0f90ef77d15b898db..af93da4ad2b96b2909bd872327c9199daa6f15ec 100644
>--- a/Source/WebKit/UIProcess/ios/WebPageProxyIOS.mm
>+++ b/Source/WebKit/UIProcess/ios/WebPageProxyIOS.mm
>@@ -306,53 +306,14 @@ void WebPageProxy::overflowScrollDidEndScroll()
>     m_pageClient.overflowScrollDidEndScroll();
> }
> 
>-void WebPageProxy::dynamicViewportSizeUpdate(const FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const FloatRect& targetExposedContentRect, const FloatRect& targetUnobscuredRect, const FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& unobscuredSafeAreaInsets, double targetScale, int32_t deviceOrientation)
>+void WebPageProxy::dynamicViewportSizeUpdate(const FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const FloatRect& targetExposedContentRect, const FloatRect& targetUnobscuredRect, const FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& unobscuredSafeAreaInsets, double targetScale, int32_t deviceOrientation, uint64_t dynamicViewportSizeUpdateID)
> {
>     if (!isValid())
>         return;
> 
>     hideValidationMessage();
> 
>-    m_dynamicViewportSizeUpdateWaitingForTarget = true;
>-    m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit = true;
>-    m_process->send(Messages::WebPage::DynamicViewportSizeUpdate(viewLayoutSize, maximumUnobscuredSize, targetExposedContentRect, targetUnobscuredRect, targetUnobscuredRectInScrollViewCoordinates, unobscuredSafeAreaInsets, targetScale, deviceOrientation, ++m_currentDynamicViewportSizeUpdateID), m_pageID);
>-}
>-
>-void WebPageProxy::synchronizeDynamicViewportUpdate()
>-{
>-    if (!isValid())
>-        return;
>-
>-    if (m_dynamicViewportSizeUpdateWaitingForTarget) {
>-        // We do not want the UIProcess to finish animated resize with the old content size, scale, etc.
>-        // If that happens, the UIProcess would start pushing new VisibleContentRectUpdateInfo to the WebProcess with
>-        // invalid informations.
>-        //
>-        // Ideally, the animated resize should just be transactional, and the UIProcess would remain in the "resize" state
>-        // until both DynamicViewportUpdateChangedTarget and the associated commitLayerTree are finished.
>-        // The tricky part with such implementation is if a second animated resize starts before the end of the previous one.
>-        // In that case, the values used for the target state needs to be computed from the output of the previous animated resize.
>-        //
>-        // The following is a workaround to have the UIProcess in a consistent state.
>-        // Instead of handling nested resize, we block the UIProcess until the animated resize finishes.
>-        double newScale;
>-        FloatPoint newScrollPosition;
>-        uint64_t nextValidLayerTreeTransactionID;
>-        if (m_process->sendSync(Messages::WebPage::SynchronizeDynamicViewportUpdate(), Messages::WebPage::SynchronizeDynamicViewportUpdate::Reply(newScale, newScrollPosition, nextValidLayerTreeTransactionID), m_pageID, 2_s)) {
>-            m_dynamicViewportSizeUpdateWaitingForTarget = false;
>-            m_dynamicViewportSizeUpdateLayerTreeTransactionID = nextValidLayerTreeTransactionID;
>-            m_pageClient.dynamicViewportUpdateChangedTarget(newScale, newScrollPosition, nextValidLayerTreeTransactionID);
>-        }
>-
>-    }
>-
>-    // If m_dynamicViewportSizeUpdateWaitingForTarget is false, we are waiting for the next valid frame with the hope it is the one for the new target.
>-    // If m_dynamicViewportSizeUpdateWaitingForTarget is still true, this is a desperate attempt to get the valid frame before finishing the animation.
>-    if (m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit)
>-        m_drawingArea->waitForDidUpdateActivityState();
>-
>-    m_dynamicViewportSizeUpdateWaitingForTarget = false;
>-    m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit = false;
>+    m_process->send(Messages::WebPage::DynamicViewportSizeUpdate(viewLayoutSize, maximumUnobscuredSize, targetExposedContentRect, targetUnobscuredRect, targetUnobscuredRectInScrollViewCoordinates, unobscuredSafeAreaInsets, targetScale, deviceOrientation, dynamicViewportSizeUpdateID), m_pageID);
> }
> 
> void WebPageProxy::setViewportConfigurationViewLayoutSize(const WebCore::FloatSize& size)
>@@ -407,11 +368,6 @@ void WebPageProxy::didCommitLayerTree(const WebKit::RemoteLayerTreeTransaction&
>         }
>     }
> 
>-    if (!m_dynamicViewportSizeUpdateWaitingForTarget && m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit) {
>-        if (layerTreeTransaction.transactionID() >= m_dynamicViewportSizeUpdateLayerTreeTransactionID)
>-            m_dynamicViewportSizeUpdateWaitingForLayerTreeCommit = false;
>-    }
>-
>     m_pageClient.didCommitLayerTree(layerTreeTransaction);
> 
>     // FIXME: Remove this special mechanism and fold it into the transaction's layout milestones.
>@@ -904,18 +860,6 @@ float WebPageProxy::textAutosizingWidth()
>     return WebCore::screenSize().width();
> }
> 
>-void WebPageProxy::dynamicViewportUpdateChangedTarget(double newScale, const WebCore::FloatPoint& newScrollPosition, uint64_t dynamicViewportSizeUpdateID)
>-{
>-    if (dynamicViewportSizeUpdateID != m_currentDynamicViewportSizeUpdateID)
>-        return;
>-
>-    if (m_dynamicViewportSizeUpdateWaitingForTarget) {
>-        m_dynamicViewportSizeUpdateLayerTreeTransactionID = downcast<RemoteLayerTreeDrawingAreaProxy>(*drawingArea()).nextLayerTreeTransactionID();
>-        m_dynamicViewportSizeUpdateWaitingForTarget = false;
>-        m_pageClient.dynamicViewportUpdateChangedTarget(newScale, newScrollPosition, m_dynamicViewportSizeUpdateLayerTreeTransactionID);
>-    }
>-}
>-
> void WebPageProxy::couldNotRestorePageState()
> {
>     m_pageClient.couldNotRestorePageState();
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>index 714d0f1547a3418ae2dc4ebc6da326074f0ded9a..051a04cfca9f7af2a87d564c25832da42c5945e2 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>@@ -3219,11 +3219,13 @@ void WebPage::willCommitLayerTree(RemoteLayerTreeTransaction& layerTransaction)
>     layerTransaction.setAvoidsUnsafeArea(m_viewportConfiguration.avoidsUnsafeArea());
>     layerTransaction.setIsInStableState(m_isInStableState);
>     layerTransaction.setAllowsUserScaling(allowsUserScaling());
>+    if (m_pendingDynamicViewportSizeUpdateID) {
>+        layerTransaction.setDynamicViewportSizeUpdateID(*m_pendingDynamicViewportSizeUpdateID);
>+        m_pendingDynamicViewportSizeUpdateID = std::nullopt;
>+    }
> #endif
> 
>-#if PLATFORM(MAC)
>     layerTransaction.setScrollPosition(frameView->scrollPosition());
>-#endif
> 
>     if (m_hasPendingEditorStateUpdate) {
>         layerTransaction.setEditorState(editorState());
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
>index 333c7cc83e3249070910c4c3ea9b788eab06b900..49fcc6218a08652c4092149c6e678878e246ee6b 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
>@@ -886,7 +886,6 @@ public:
>     void setMaximumUnobscuredSize(const WebCore::FloatSize&);
>     void setDeviceOrientation(int32_t);
>     void dynamicViewportSizeUpdate(const WebCore::FloatSize& viewLayoutSize, const WebCore::FloatSize& maximumUnobscuredSize, const WebCore::FloatRect& targetExposedContentRect, const WebCore::FloatRect& targetUnobscuredRect, const WebCore::FloatRect& targetUnobscuredRectInScrollViewCoordinates, const WebCore::FloatBoxExtent& targetUnobscuredSafeAreaInsets, double scale, int32_t deviceOrientation, uint64_t dynamicViewportSizeUpdateID);
>-    void synchronizeDynamicViewportUpdate(double& newTargetScale, WebCore::FloatPoint& newScrollPosition, uint64_t& nextValidLayerTreeTransactionID);
>     std::optional<float> scaleFromUIProcess(const VisibleContentRectUpdateInfo&) const;
>     void updateVisibleContentRects(const VisibleContentRectUpdateInfo&, MonotonicTime oldestTimestamp);
>     bool scaleWasSetByUIProcess() const { return m_scaleWasSetByUIProcess; }
>@@ -1657,6 +1656,7 @@ private:
>     WebCore::FloatPoint m_pendingSyntheticClickLocation;
>     WebCore::FloatRect m_previousExposedContentRect;
>     uint64_t m_currentAssistedNodeIdentifier { 0 };
>+    std::optional<uint64_t> m_pendingDynamicViewportSizeUpdateID;
> #endif
> 
>     WebCore::Timer m_layerVolatilityTimer;
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>index 41b5147cb5a4f71cff5af725bbd8a7cdbcb121ac..67ccf020a4dabd7c7a3e4e9cfa36e3d42b35f6a9 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>@@ -49,7 +49,6 @@ messages -> WebPage LegacyReceiver {
>     SetMaximumUnobscuredSize(WebCore::FloatSize size)
>     SetDeviceOrientation(int32_t deviceOrientation)
>     DynamicViewportSizeUpdate(WebCore::FloatSize viewLayoutSize, WebCore::FloatSize maximumUnobscuredSize, WebCore::FloatRect targetExposedContentRect, WebCore::FloatRect targetUnobscuredRect, WebCore::FloatRect targetUnobscuredRectInScrollViewCoordinates, WebCore::RectEdges<float> targetUnobscuredSafeAreaInsets, double scale, int32_t deviceOrientation, uint64_t dynamicViewportSizeUpdateID)
>-    SynchronizeDynamicViewportUpdate() -> (double newTargetScale, WebCore::FloatPoint newScrollPosition, uint64_t nextValidLayerTreeTransactionID)
> 
>     HandleTap(WebCore::IntPoint point, uint64_t lastLayerTreeTransactionId)
>     PotentialTapAtPosition(uint64_t requestID, WebCore::FloatPoint point)
>diff --git a/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm b/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm
>index 2474130b1dc42d7e9ea45e7b43023f12dfcb4c2c..cdbb1f141e5cf2cb3f53e99e18f6adcd7ad89d73 100644
>--- a/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm
>+++ b/Source/WebKit/WebProcess/WebPage/ios/WebPageIOS.mm
>@@ -2670,14 +2670,7 @@ void WebPage::dynamicViewportSizeUpdate(const FloatSize& viewLayoutSize, const W
> 
>     m_drawingArea->scheduleCompositingLayerFlush();
> 
>-    send(Messages::WebPageProxy::DynamicViewportUpdateChangedTarget(pageScaleFactor(), frameView.scrollPosition(), dynamicViewportSizeUpdateID));
>-}
>-
>-void WebPage::synchronizeDynamicViewportUpdate(double& newTargetScale, FloatPoint& newScrollPosition, uint64_t& nextValidLayerTreeTransactionID)
>-{
>-    newTargetScale = pageScaleFactor();
>-    newScrollPosition = m_page->mainFrame().view()->scrollPosition();
>-    nextValidLayerTreeTransactionID = downcast<RemoteLayerTreeDrawingArea>(*m_drawingArea).nextTransactionID();
>+    m_pendingDynamicViewportSizeUpdateID = dynamicViewportSizeUpdateID;
> }
> 
> void WebPage::resetViewportDefaultConfiguration(WebFrame* frame, bool hasMobileDocType)

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Attachments on bug 186130: 341649 | 341717 | 342020 | 342036 | 342037 | 342041