Merge 112436 - [chromium] layer->clipRect() is not initialized for layers that create a renderSurfa…

Source/WebCore/platform/graphics/chromium/cc/CCSharedQuadState.h

 /*
  * Copyright (C) 2011 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 25 matching lines @@
 class CCSharedQuadState {
     WTF_MAKE_NONCOPYABLE(CCSharedQuadState);
 public:
     static PassOwnPtr<CCSharedQuadState> create(const TransformationMatrix& quadTransform, const TransformationMatrix& layerTransform, const IntRect& layerRect, const IntRect& clipRect, float opacity, bool opaque);
 
     // The transform that quads in a CCDrawQuad should be transformed with.
     const TransformationMatrix& quadTransform() const { return m_quadTransform; }
     // The transform that layerRect() should be transformed with.
     const TransformationMatrix& layerTransform() const { return m_layerTransform; }
     const IntRect& layerRect() const { return m_layerRect; }
+    // Usage: if clipRect is empty, this clipRect should not be used.
     const IntRect& clipRect() const { return m_clipRect; }
 
     float opacity() const { return m_opacity; }
     bool isOpaque() const { return m_opaque; }
     bool isLayerAxisAlignedIntRect() const;
 
 private:
     CCSharedQuadState(const TransformationMatrix& quadTransform, const TransformationMatrix& layerTransform, const IntRect& layerRect, const IntRect& clipRect, float opacity, bool opaque);
 
     TransformationMatrix m_quadTransform;
     TransformationMatrix m_layerTransform;
     IntRect m_layerRect;
     IntRect m_clipRect;
     float m_opacity;
     bool m_opaque;
 };
 
 }
 
 #endif