CompositedLayerMapping should use dirty bits for bounds update

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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 1402 matching lines @@
     }
     return true;
 }
 
 // Recurs down the RenderLayer tree until its finds the compositing descendants of compositingAncestor and updates their geometry.
 void RenderLayerCompositor::updateCompositingDescendantGeometry(RenderLayerStackingNode* compositingAncestor, RenderLayer* layer, bool compositedChildrenOnly)
 {
     if (layer->stackingNode() != compositingAncestor) {
         if (layer->hasCompositedLayerMapping()) {
             CompositedLayerMappingPtr compositedLayerMapping = layer->compositedLayerMapping();
-            compositedLayerMapping->updateCompositedBounds();
+            compositedLayerMapping->updateCompositedBounds(GraphicsLayerUpdater::ForceUpdate);
 
             if (layer->reflectionInfo()) {
                 RenderLayer* reflectionLayer = layer->reflectionInfo()->reflectionLayer();
                 if (reflectionLayer->hasCompositedLayerMapping())
-                    reflectionLayer->compositedLayerMapping()->updateCompositedBounds();
+                    reflectionLayer->compositedLayerMapping()->updateCompositedBounds(GraphicsLayerUpdater::ForceUpdate);
             }
 
             compositedLayerMapping->updateGraphicsLayerGeometry(GraphicsLayerUpdater::ForceUpdate);
             if (compositedChildrenOnly)
                 return;
         }
     }
 
     if (layer->reflectionInfo())
         updateCompositingDescendantGeometry(compositingAncestor, layer->reflectionInfo()->reflectionLayer(), compositedChildrenOnly);
@@ skipping 821 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore