[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 307 matching lines @@
 void LayoutView::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ViewPainter(*this).paint(paintInfo, paintOffset);
 }
 
 void LayoutView::paintBoxDecorationBackground(const PaintInfo& paintInfo, const LayoutPoint&)
 {
     ViewPainter(*this).paintBoxDecorationBackground(paintInfo);
 }
 
-void LayoutView::invalidateTreeIfNeeded(const PaintInvalidationState& paintInvalidationState)
+void LayoutView::invalidateTreeIfNeeded(PaintInvalidationState& paintInvalidationState)
 {
     ASSERT(!needsLayout());
 
     // We specifically need to issue paint invalidations for the viewRect since other renderers
     // short-circuit on full-paint invalidation.
     LayoutRect dirtyRect = viewRect();
     if (doingFullPaintInvalidation() && !dirtyRect.isEmpty()) {
         const LayoutBoxModelObject* paintInvalidationContainer = &paintInvalidationState.paintInvalidationContainer();
         DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(this, paintInvalidationContainer, dirtyRect, &paintInvalidationState);
         invalidatePaintUsingContainer(paintInvalidationContainer, dirtyRect, PaintInvalidationFull);
@@ skipping 618 matching lines @@
     return viewHeight(IncludeScrollbars) / scale;
 }
 
 void LayoutView::willBeDestroyed()
 {
     LayoutBlockFlow::willBeDestroyed();
     m_compositor.clear();
 }
 
 } // namespace blink