cc: Avoid expensive RenderingStats collection.

cc/texture_layer.h

 // Copyright 2010 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_TEXTURE_LAYER_H_
 #define CC_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 46 matching lines @@
 
     // Code path for plugins which supply their own texture ID.
     void setTextureMailbox(const TextureMailbox&);
 
     void willModifyTexture();
 
     virtual void setNeedsDisplayRect(const gfx::RectF&) OVERRIDE;
 
     virtual void setLayerTreeHost(LayerTreeHost*) OVERRIDE;
     virtual bool drawsContent() const OVERRIDE;
-    virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats&) OVERRIDE;
+    virtual void update(ResourceUpdateQueue&, const OcclusionTracker*, RenderingStats*) OVERRIDE;
     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
     virtual bool blocksPendingCommit() const OVERRIDE;
 
     virtual bool canClipSelf() const OVERRIDE;
 
 protected:
     TextureLayer(TextureLayerClient*, bool usesMailbox);
     virtual ~TextureLayer();
 
 private:
     TextureLayerClient* m_client;
     bool m_usesMailbox;
 
     bool m_flipped;
     gfx::PointF m_uvTopLeft;
     gfx::PointF m_uvBottomRight;
     // [bottom left, top left, top right, bottom right]
     float m_vertexOpacity[4];
     bool m_premultipliedAlpha;
     bool m_rateLimitContext;
     bool m_contextLost;
     bool m_contentCommitted;
 
     unsigned m_textureId;
     TextureMailbox m_textureMailbox;
 };
 
 }
 #endif  // CC_TEXTURE_LAYER_H_