Remove QuadCuller class and make QuadSink concrete

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 0b503e4952979be1d7da299ae476f1eb5b07ca06..c033bfb489e89b8978e4aac5d3b9f4ea07beb219 100644
--- a/cc/layers/quad_sink.h
+++ b/cc/layers/quad_sink.h
@@ -17,26 +17,41 @@ namespace cc {
 
 class DrawQuad;
 class LayerImpl;
+class RenderPass;
+class RenderSurfaceImpl;
 class SharedQuadState;
+template <typename LayerType>
+class OcclusionTracker;
 
 class CC_EXPORT QuadSink {
  public:
-  virtual ~QuadSink() {}
+  QuadSink(RenderPass* render_pass,
+           const OcclusionTracker<LayerImpl>* occlusion_tracker);
+  ~QuadSink() {}
 
   // Call this to add a SharedQuadState before appending quads that refer to it.
   // Returns a pointer to the given SharedQuadState, that can be set on the
   // quads to append.
-  virtual SharedQuadState* CreateSharedQuadState() = 0;
+  virtual SharedQuadState* CreateSharedQuadState();
 
-  virtual gfx::Rect UnoccludedContentRect(
-      const gfx::Rect& content_rect,
-      const gfx::Transform& draw_transform) = 0;
+  virtual gfx::Rect UnoccludedContentRect(const gfx::Rect& content_rect,
+                                          const gfx::Transform& draw_transform);
 
   virtual gfx::Rect UnoccludedContributingSurfaceContentRect(
       const gfx::Rect& content_rect,
-      const gfx::Transform& draw_transform) = 0;
+      const gfx::Transform& draw_transform);
 
-  virtual void Append(scoped_ptr<DrawQuad> draw_quad) = 0;
+  virtual void Append(scoped_ptr<DrawQuad> draw_quad);
+
+ protected:
+  RenderPass* render_pass_;
+
+  SharedQuadState* current_shared_quad_state_;
+
+ private:
+  const OcclusionTracker<LayerImpl>* occlusion_tracker_;
+
+  DISALLOW_COPY_AND_ASSIGN(QuadSink);
 };
 
 }  // namespace cc