cc: Update picture pile on tiles to prevent memory leak

cc/picture_layer_tiling.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_PICTURE_LAYER_TILING_H_
 #define CC_PICTURE_LAYER_TILING_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/hash_pair.h"
 #include "cc/region.h"
 #include "cc/tile.h"
 #include "cc/tile_priority.h"
 #include "cc/tiling_data.h"
 #include "ui/gfx/rect.h"
 
 namespace cc {
 
 class PictureLayerTiling;
 
 class PictureLayerTilingClient {
   public:
    virtual scoped_refptr<Tile> CreateTile(PictureLayerTiling*, gfx::Rect) = 0;
+   virtual void UpdatePile(Tile* tile) = 0;
 };
 
 class CC_EXPORT PictureLayerTiling {
  public:
   ~PictureLayerTiling();
 
   static scoped_ptr<PictureLayerTiling> Create(float contents_scale,
                                                gfx::Size tile_size);
   scoped_ptr<PictureLayerTiling> Clone() const;
 
@@ skipping 81 matching lines @@
   TileMap tiles_;
   TilingData tiling_data_;
   TileResolution resolution_;
 
   friend class Iterator;
 };
 
 }  // namespace cc
 
 #endif  // CC_PICTURE_LAYER_TILING_H_