Repaint squashing content in cases where the entire frame is repainting.

Source/core/rendering/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1851 matching lines @@
 #endif
 
 struct SetContentsNeedsDisplayFunctor {
     void operator() (GraphicsLayer* layer) const
     {
         if (layer->drawsContent())
             layer->setNeedsDisplay();
     }
 };
 
+void CompositedLayerMapping::setSquashingContentsNeedDisplay()
+{
+    ApplyToGraphicsLayers(this, SetContentsNeedsDisplayFunctor(), ApplyToSquashingLayer);
+}
+
 void CompositedLayerMapping::setContentsNeedDisplay()
 {
     // FIXME: need to split out repaints for the background.
     ASSERT(!paintsIntoCompositedAncestor());
     ApplyToGraphicsLayers(this, SetContentsNeedsDisplayFunctor(), ApplyToContentLayers);
 }
 
 struct SetContentsNeedsDisplayInRectFunctor {
     void operator() (GraphicsLayer* layer) const
     {
@@ skipping 335 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore