cc: Apply occlusion before creating quads in RenderSurfaceImpl.

cc/layers/quad_sink.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_LAYERS_QUAD_SINK_H_
 #define CC_LAYERS_QUAD_SINK_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace gfx {
 class Rect;
 class Transform;
 }
 
 namespace cc {
 
 class DrawQuad;
+class LayerImpl;
 class SharedQuadState;
 
 class CC_EXPORT QuadSink {
  public:
   virtual ~QuadSink() {}
 
   // Call this to add a SharedQuadState before appending quads that refer to it.
   // Returns a pointer to the given SharedQuadState for convenience, that can be
   // set on the quads to append.
   virtual SharedQuadState* UseSharedQuadState(
       scoped_ptr<SharedQuadState> shared_quad_state) = 0;
 
   virtual gfx::Rect UnoccludedContentRect(
       const gfx::Rect& content_rect,
       const gfx::Transform& draw_transform) = 0;
 
+  virtual gfx::Rect UnoccludedContributingSurfaceContentRect(
+      gfx::Rect& content_rect,
+      gfx::Transform& draw_transform) = 0;
+
   // Returns true if the quad is added to the list, and false if the quad is
   // entirely culled.
   virtual bool MaybeAppend(scoped_ptr<DrawQuad> draw_quad) = 0;
 
   virtual void Append(scoped_ptr<DrawQuad> draw_quad) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_QUAD_SINK_H_