cc: Avoid expensive RenderingStats collection.

cc/bitmap_content_layer_updater.h

Index: cc/bitmap_content_layer_updater.h
diff --git a/cc/bitmap_content_layer_updater.h b/cc/bitmap_content_layer_updater.h
index f951a55dcd845afbec5e491056c78be2b603d7e9..9f6af1c4a7571d985b66252aae079715a5e2f9ce 100644
--- a/cc/bitmap_content_layer_updater.h
+++ b/cc/bitmap_content_layer_updater.h
@@ -25,7 +25,7 @@ public:
         Resource(BitmapContentLayerUpdater*, scoped_ptr<PrioritizedResource>);
         virtual ~Resource();
 
-        virtual void update(ResourceUpdateQueue&, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats&) OVERRIDE;
+        virtual void update(ResourceUpdateQueue&, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats*) OVERRIDE;
 
     private:
         BitmapContentLayerUpdater* updater() { return m_updater; }
@@ -36,7 +36,7 @@ public:
     static scoped_refptr<BitmapContentLayerUpdater> create(scoped_ptr<LayerPainter>);
 
     virtual scoped_ptr<LayerUpdater::Resource> createResource(PrioritizedResourceManager*) OVERRIDE;
-    virtual void prepareToUpdate(const gfx::Rect& contentRect, const gfx::Size& tileSize, float contentsWidthScale, float contentsHeightScale, gfx::Rect& resultingOpaqueRect, RenderingStats&) OVERRIDE;
+    virtual void prepareToUpdate(const gfx::Rect& contentRect, const gfx::Size& tileSize, float contentsWidthScale, float contentsHeightScale, gfx::Rect& resultingOpaqueRect, RenderingStats*) OVERRIDE;
     void updateTexture(ResourceUpdateQueue&, PrioritizedResource*, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate);
 
     virtual void setOpaque(bool) OVERRIDE;