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

cc/resources/picture_pile_impl.h

 // Copyright 2012 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_RESOURCES_PICTURE_PILE_IMPL_H_
 #define CC_RESOURCES_PICTURE_PILE_IMPL_H_
 
 #include <list>
 #include <map>
 
 #include "cc/base/cc_export.h"
 #include "cc/resources/picture_pile_base.h"
 #include "skia/ext/analysis_canvas.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkPicture.h"
 
 namespace cc {
-struct RenderingStats;
 
 class CC_EXPORT PicturePileImpl : public PicturePileBase {
  public:
   static scoped_refptr<PicturePileImpl> Create();
   static scoped_refptr<PicturePileImpl> CreateFromOther(
       const PicturePileBase* other);
 
   // Get paint-safe version of this picture for a specific thread.
   PicturePileImpl* GetCloneForDrawingOnThread(unsigned thread_index) const;
 
@@ skipping 55 matching lines @@
   // This guarantees thread-safe access during the life
   // time of a PicturePileImpl instance.
   const ClonesForDrawing clones_for_drawing_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePileImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_IMPL_H_