cc: Avoid expensive RenderingStats collection.

cc/skpicture_content_layer_updater.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 #ifndef CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 #define CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_
 
 #include "cc/content_layer_updater.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 class SkCanvas;
 
 namespace cc {
 
 class LayerPainter;
 
 // This class records the contentRect into an SkPicture. Subclasses, provide
 // different implementations of tile updating based on this recorded picture.
 // The BitmapSkPictureContentLayerUpdater and
 // FrameBufferSkPictureContentLayerUpdater are two examples of such
 // implementations.
 class SkPictureContentLayerUpdater : public ContentLayerUpdater {
 public:
     class Resource : public LayerUpdater::Resource {
     public:
         Resource(SkPictureContentLayerUpdater*, 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:
         SkPictureContentLayerUpdater* updater() { return m_updater; }
 
         SkPictureContentLayerUpdater* m_updater;
     };
 
     static scoped_refptr<SkPictureContentLayerUpdater> create(scoped_ptr<LayerPainter>);
 
     virtual scoped_ptr<LayerUpdater::Resource> createResource(PrioritizedResourceManager*) OVERRIDE;
     virtual void setOpaque(bool) OVERRIDE;
 
 protected:
     explicit SkPictureContentLayerUpdater(scoped_ptr<LayerPainter>);
     virtual ~SkPictureContentLayerUpdater();
 
-    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 drawPicture(SkCanvas*);
     void updateTexture(ResourceUpdateQueue& queue, PrioritizedResource* texture, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate);
 
     bool layerIsOpaque() const { return m_layerIsOpaque; }
 
 private:
     // Recording canvas.
     SkPicture m_picture;
     // True when it is known that all output pixels will be opaque.
     bool m_layerIsOpaque;
 };
 
 } // namespace cc
 #endif  // CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_