cc: Add PictureLayerTiling for impl-side painting

cc/tile.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_TILE_H_
 #define CC_TILE_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 55 matching lines @@
        GLenum format,
        gfx::Rect rect_inside_picture,
        TileQuality quality);
 
   void SetPicturePile(int frame_number, PicturePile* picture_pile);
   void ModifyPriority(int frame_number, const TilePriority& priority);
 
   // Returns 0 if not drawable.
   ResourceProvider::ResourceId GetDrawableResourceId(int frame_number);
 
+  const gfx::Rect& opaque_rect() const { return opaque_rect_; }
+  // TODO(enne): Make this real
+  bool contents_swizzled() const { return false; }
+
  protected:
   // Methods called by TileManager.
   void DeleteVersionOnRequestOfTileManager(int frame_number);
 
  private:
   friend class base::RefCounted<Tile>;
   friend class TileManager;
 
   TileVersion* GetVersion(int frame_number);
   ~Tile();
 
   TileManager* tile_manager_;
   gfx::Rect tile_size_;
   GLenum format_;
   gfx::Rect rect_inside_picture_;
+  gfx::Rect opaque_rect_;
   TileQuality quality_;
   ScopedVector<TileVersion> versions_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TILE_H_