[#7] Pass gfx structs by const ref (gfx::Size)

cc/resources/tile.cc

 // 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.
 
 #include "cc/resources/tile.h"
 
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/tile_manager.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
 Tile::Id Tile::s_next_id_ = 0;
 
 Tile::Tile(TileManager* tile_manager,
            PicturePileImpl* picture_pile,
-           gfx::Size tile_size,
+           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)
   : RefCountedManaged<Tile>(tile_manager),
     tile_manager_(tile_manager),
     tile_size_(tile_size),
     content_rect_(content_rect),
@@ skipping 46 matching lines @@
 }
 
 size_t Tile::GPUMemoryUsageInBytes() const {
   size_t total_size = 0;
   for (int mode = 0; mode < NUM_RASTER_MODES; ++mode)
     total_size += managed_state_.tile_versions[mode].GPUMemoryUsageInBytes();
   return total_size;
 }
 
 }  // namespace cc