CompositedLayerMapping should use dirty bits for bounds update

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
@@ skipping 148 matching lines @@
 
 GraphicsLayerUpdater::UpdateType GraphicsLayerUpdater::update(RenderLayer& layer, UpdateType updateType)
 {
     if (!layer.hasCompositedLayerMapping())
         return updateType;
 
     CompositedLayerMappingPtr mapping = layer.compositedLayerMapping();
 
     // Note carefully: here we assume that the compositing state of all descendants have been updated already,
     // so it is legitimate to compute and cache the composited bounds for this layer.
-    mapping->updateCompositedBounds();
+    mapping->updateCompositedBounds(updateType);
 
     if (RenderLayerReflectionInfo* reflection = layer.reflectionInfo()) {
         if (reflection->reflectionLayer()->hasCompositedLayerMapping())
-            reflection->reflectionLayer()->compositedLayerMapping()->updateCompositedBounds();
+            reflection->reflectionLayer()->compositedLayerMapping()->updateCompositedBounds(ForceUpdate);
     }
 
     mapping->updateGraphicsLayerConfiguration();
     updateType = mapping->updateGraphicsLayerGeometry(updateType);
     mapping->clearNeedsGeometryUpdate();
 
     if (!layer.parent())
         layer.compositor()->updateRootLayerPosition();
 
     if (mapping->hasUnpositionedOverflowControlsLayers())
         layer.scrollableArea()->positionOverflowControls();
 
     return updateType;
 }
 
 } // namespace WebCore