Remove const LayerImpl* from QuadSink

cc/layers/quad_sink.h

Index: cc/layers/quad_sink.h
diff --git a/cc/layers/quad_sink.h b/cc/layers/quad_sink.h
index ce14a3af14c45a68b9c2f45827c053276c1e95b5..f6f72199e9c69777fd042b64a75c52e61d86aaeb 100644
--- a/cc/layers/quad_sink.h
+++ b/cc/layers/quad_sink.h
@@ -26,7 +26,6 @@ class OcclusionTracker;
 class CC_EXPORT QuadSink {
  public:
   QuadSink(RenderPass* render_pass,
-           const LayerImpl* layer,
            const OcclusionTracker<LayerImpl>* occlusion_tracker);
   ~QuadSink() {}
 
@@ -35,10 +34,12 @@ class CC_EXPORT QuadSink {
   // quads to append.
   virtual SharedQuadState* CreateSharedQuadState();
 
-  virtual gfx::Rect UnoccludedContentRect(const gfx::Rect& content_rect,
+  virtual gfx::Rect UnoccludedContentRect(const LayerImpl* layer,
+                                          const gfx::Rect& content_rect,
                                           const gfx::Transform& draw_transform);
 
   virtual gfx::Rect UnoccludedContributingSurfaceContentRect(
+      const LayerImpl* layer,
       const gfx::Rect& content_rect,
       const gfx::Transform& draw_transform);
 
@@ -46,7 +47,6 @@ class CC_EXPORT QuadSink {
 
  protected:
   RenderPass* render_pass_;
-  const LayerImpl* layer_;
 
   SharedQuadState* current_shared_quad_state_;