cc: Report only on active tiles in tracing.

cc/layers/picture_layer_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_LAYERS_PICTURE_LAYER_IMPL_H_
 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
 
+#include <set>
 #include <string>
 #include <vector>
 
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/resources/picture_layer_tiling.h"
 #include "cc/resources/picture_layer_tiling_set.h"
 #include "cc/resources/picture_pile_impl.h"
 #include "skia/ext/refptr.h"
@@ skipping 160 matching lines @@
       DoPostCommitInitialization();
   }
   void DoPostCommitInitialization();
 
   bool CanHaveTilings() const;
   bool CanHaveTilingWithScale(float contents_scale) const;
   void SanityCheckTilingState() const;
 
   virtual void GetDebugBorderProperties(
       SkColor* color, float* width) const OVERRIDE;
+  virtual void AllTilesForTracingInto(
+      std::set<const Tile*>* tiles) const OVERRIDE;
   virtual void AsValueInto(base::debug::TracedValue* dict) const OVERRIDE;
 
   virtual void UpdateIdealScales();
   float MaximumTilingContentsScale() const;
 
   PictureLayerImpl* twin_layer_;
 
   scoped_ptr<PictureLayerTilingSet> tilings_;
   scoped_refptr<PicturePileImpl> pile_;
   Region invalidation_;
@@ skipping 24 matching lines @@
   gfx::Rect viewport_rect_for_tile_priority_;
   gfx::Transform screen_space_transform_for_tile_priority_;
 
   friend class PictureLayer;
   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_