cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

cc/layer_tree_host_impl.h

Index: cc/layer_tree_host_impl.h
diff --git a/cc/layer_tree_host_impl.h b/cc/layer_tree_host_impl.h
index 6e90e93fc2913272e7a89bfde1b324240eb4e5d9..ed09f7c02ae833c9cf836341e548feafd2549034 100644
--- a/cc/layer_tree_host_impl.h
+++ b/cc/layer_tree_host_impl.h
@@ -16,6 +16,7 @@
 #include "cc/render_pass.h"
 #include "cc/render_pass_sink.h"
 #include "cc/renderer.h"
+#include "cc/rendering_stats_instrumentation.h"
 #include "cc/tile_manager.h"
 #include "cc/top_controls_manager_client.h"
 #include "skia/ext/refptr.h"
@@ -39,7 +40,6 @@ class RenderPassDrawQuad;
 class ResourceProvider;
 class TopControlsManager;
 struct RendererCapabilities;
-struct RenderingStats;
 
 // LayerTreeHost->Proxy callback interface.
 class LayerTreeHostImplClient {
@@ -80,7 +80,8 @@ 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
@@ -231,8 +232,6 @@ 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,
@@ -322,9 +321,11 @@ 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.
@@ -438,6 +439,8 @@ class CC_EXPORT LayerTreeHostImpl : public InputHandlerClient,
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
+  RenderingStatsInstrumentation* rendering_stats_instrumentation_;
+
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };