[S.P.] Don't draw frames of animated images that are offscreen

Source/core/layout/LayoutView.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 324 matching lines @@
     if (doingFullPaintInvalidation() && !dirtyRect.isEmpty()) {
         const LayoutBoxModelObject* paintInvalidationContainer = &paintInvalidationState.paintInvalidationContainer();
         DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(this, paintInvalidationContainer, dirtyRect, &paintInvalidationState);
         invalidatePaintUsingContainer(paintInvalidationContainer, dirtyRect, PaintInvalidationFull);
         if (RuntimeEnabledFeatures::slimmingPaintEnabled())
             invalidateDisplayItemClients(*paintInvalidationContainer);
     }
     LayoutBlock::invalidateTreeIfNeeded(paintInvalidationState);
 }
 
+void LayoutView::invalidatePaintForDelayedTargets()
+{
+    for (auto& target : m_pendingDelayedPaintInvalidations)
+        target->setShouldDoFullPaintInvalidation(PaintInvalidationDelayedFull);
+    m_pendingDelayedPaintInvalidations.clear();
+}
+
 void LayoutView::invalidatePaintForRectangle(const LayoutRect& paintInvalidationRect, PaintInvalidationReason invalidationReason) const
 {
     ASSERT(!paintInvalidationRect.isEmpty());
 
     if (document().printing() || !m_frameView)
         return;
 
     ASSERT(layer()->compositingState() == PaintsIntoOwnBacking || !frame()->ownerLayoutObject());
 
     if (layer()->compositingState() == PaintsIntoOwnBacking) {
@@ skipping 602 matching lines @@
     return viewHeight(IncludeScrollbars) / scale;
 }
 
 void LayoutView::willBeDestroyed()
 {
     LayoutBlockFlow::willBeDestroyed();
     m_compositor.clear();
 }
 
 } // namespace blink