cc: Remove the opaque rect return-parameter from ContentLayerClient.

cc/resources/tile_manager.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_TILE_MANAGER_H_
 #define CC_RESOURCES_TILE_MANAGER_H_
 
 #include <deque>
 #include <queue>
 #include <set>
@@ skipping 85 matching lines @@
   virtual ~TileManager();
 
   void ManageTiles(const GlobalStateThatImpactsTilePriority& state);
 
   // Returns true when visible tiles have been initialized.
   bool UpdateVisibleTiles();
 
   scoped_refptr<Tile> CreateTile(PicturePileImpl* picture_pile,
                                  const gfx::Size& tile_size,
                                  const gfx::Rect& content_rect,
-                                 const gfx::Rect& opaque_rect,
                                  float contents_scale,
                                  int layer_id,
                                  int source_frame_number,
                                  int flags);
 
   scoped_refptr<base::debug::ConvertableToTraceFormat> BasicStateAsValue()
       const;
   void BasicStateAsValueInto(base::debug::TracedValue* dict) const;
   const MemoryHistory::Entry& memory_stats_from_last_assign() const {
     return memory_stats_from_last_assign_;
@@ skipping 147 matching lines @@
   std::vector<scoped_refptr<RasterTask> > orphan_raster_tasks_;
 
   UniqueNotifier ready_to_activate_check_notifier_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_