cc: Switch RenderingStats collection in Layer::Update() to RenderingStatsInstrumentation

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index c0c34cc4b74cbe21f2cb6b5da997e9001c41fe44..19a44e44a78319a99a0443a659f96b9194bd5d8c 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -43,7 +43,7 @@ class PriorityCalculator;
 class ResourceUpdateQueue;
 class ScrollbarLayer;
 struct AnimationEvent;
-struct RenderingStats;
+class RenderingStatsInstrumentation;
 
 // Base class for composited layers. Special layer types are derived from
 // this class.
@@ -267,8 +267,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   // These methods typically need to be overwritten by derived classes.
   virtual bool DrawsContent() const;
   virtual void Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion,
-                      RenderingStats* stats) {}
+                      const OcclusionTracker* occlusion) {}
   virtual bool NeedMoreUpdates();
   virtual void SetIsMask(bool is_mask) {}
 
@@ -370,6 +369,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   bool NeedsDisplayForTesting() const { return needs_display_; }
   void ResetNeedsDisplayForTesting() { needs_display_ = false; }
 
+  RenderingStatsInstrumentation* rendering_stats_instrumentation() const;
+
  protected:
   friend class LayerImpl;
   friend class TreeSynchronizer;