cc: Don't pass simple well-defined classes by reference.

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 <list>
 #include <queue>
 #include <set>
@@ skipping 135 matching lines @@
       scoped_ptr<ResourcePool::Resource> resource,
       int manage_tiles_call_count_when_dispatched);
   void DidFinishTileInitialization(Tile* tile);
   void DidTileTreeBinChange(Tile* tile,
                             TileManagerBin new_tree_bin,
                             WhichTree tree);
   scoped_ptr<Value> GetMemoryRequirementsAsValue() const;
 
   static void RunRasterTask(
       uint8* buffer,
-      const gfx::Rect& rect,
+      gfx::Rect rect,
       float contents_scale,
       const RasterTaskMetadata& metadata,
       RenderingStatsInstrumentation* stats_instrumentation,
       PicturePileImpl* picture_pile);
   static void RunImageDecodeTask(
       skia::LazyPixelRef* pixel_ref,
       RenderingStatsInstrumentation* stats_instrumentation);
 
   static void RecordCheapnessPredictorResults(bool is_predicted_cheap,
                                               bool is_actually_cheap);
@@ skipping 38 matching lines @@
   size_t max_pending_tasks_;
 
   base::TimeTicks anticipated_draw_time_;
 
   DISALLOW_COPY_AND_ASSIGN(TileManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_TILE_MANAGER_H_