cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 749048d8e9ff6b9931b61f5ca5a3a1718102e1b6..2f46068b22f99ac086c60e01a45325f3e83ceda2 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -35,11 +35,11 @@ class LayerTreeImpl;
 class PageScaleAnimation;
 class PaintTimeCounter;
 class MemoryHistory;
+class RenderingStatsInstrumentation;
 class RenderPassDrawQuad;
 class ResourceProvider;
 class TopControlsManager;
 struct RendererCapabilities;
-struct RenderingStats;
 
 // LayerTreeHost->Proxy callback interface.
 class LayerTreeHostImplClient {
@@ -81,7 +81,8 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
   static scoped_ptr<LayerTreeHostImpl> Create(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
-      Proxy* proxy);
+      Proxy* proxy,
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
   virtual ~LayerTreeHostImpl();
 
   // InputHandlerClient implementation
@@ -238,8 +239,6 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
     return !animation_registrar_->active_animation_controllers().empty();
   }
 
-  void CollectRenderingStats(RenderingStats* stats) const;
-
   void SendManagedMemoryStats(
       size_t memory_visible_bytes,
       size_t memory_visible_and_nearby_bytes,
@@ -329,9 +328,11 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 
  protected:
-  LayerTreeHostImpl(const LayerTreeSettings& settings,
-                    LayerTreeHostImplClient* client,
-                    Proxy* proxy);
+  LayerTreeHostImpl(
+      const LayerTreeSettings& settings,
+      LayerTreeHostImplClient* client,
+      Proxy* proxy,
+      RenderingStatsInstrumentation* rendering_stats_instrumentation);
   void ActivatePendingTree();
 
   // Virtual for testing.
@@ -448,6 +449,8 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
+  RenderingStatsInstrumentation* rendering_stats_instrumentation_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };