Remove QuadCuller class and make QuadSink concrete

cc/test/mock_quad_culler.cc

Index: cc/test/mock_quad_culler.cc
diff --git a/cc/test/mock_quad_culler.cc b/cc/test/mock_quad_culler.cc
index d3d0ce9fdcf064801b588205c91ed1ccbe83128f..e1b140bbd395ff4f07d345f5b2767e783211f3ce 100644
--- a/cc/test/mock_quad_culler.cc
+++ b/cc/test/mock_quad_culler.cc
@@ -4,25 +4,17 @@
 
 #include "cc/test/mock_quad_culler.h"
 
-#include "cc/base/math_util.h"
-#include "cc/layers/layer_impl.h"
-#include "cc/quads/draw_quad.h"
-
 namespace cc {
 
 MockQuadCuller::MockQuadCuller(
-    RenderPass* external_render_pass,
+    RenderPass* render_pass,
     MockOcclusionTracker<LayerImpl>* occlusion_tracker)
-    : active_render_pass_(external_render_pass),
+    : QuadSink(render_pass, occlusion_tracker),
       occlusion_tracker_(occlusion_tracker) {
 }
 
 MockQuadCuller::~MockQuadCuller() {}
 
-SharedQuadState* MockQuadCuller::CreateSharedQuadState() {
-  return active_render_pass_->CreateAndAppendSharedQuadState();
-}
-
 gfx::Rect MockQuadCuller::UnoccludedContentRect(
     const gfx::Rect& content_rect,
     const gfx::Transform& draw_transform) {
@@ -37,10 +29,5 @@ gfx::Rect MockQuadCuller::UnoccludedContributingSurfaceContentRect(
       content_rect, draw_transform);
 }
 
-void MockQuadCuller::Append(scoped_ptr<DrawQuad> draw_quad) {
-  DCHECK(!draw_quad->rect.IsEmpty());
-  DCHECK(!draw_quad->visible_rect.IsEmpty());
-  active_render_pass_->quad_list.push_back(draw_quad.Pass());
-}
-
 }  // namespace cc
+