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

cc/resources/tile_manager_unittest.cc

 // Copyright 2013 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/resources/tile_priority.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/fake_output_surface_client.h"
 #include "cc/test/fake_picture_pile_impl.h"
 #include "cc/test/fake_tile_manager.h"
@@ skipping 58 matching lines @@
   virtual void TearDown() OVERRIDE {
     tile_manager_.reset(NULL);
     picture_pile_ = NULL;
 
     testing::Test::TearDown();
   }
 
   TileVector CreateTilesWithSize(int count,
                                  TilePriority active_priority,
                                  TilePriority pending_priority,
-                                 gfx::Size tile_size) {
+                                 const gfx::Size& tile_size) {
     TileVector tiles;
     for (int i = 0; i < count; ++i) {
       scoped_refptr<Tile> tile = tile_manager_->CreateTile(picture_pile_.get(),
                                                            tile_size,
                                                            gfx::Rect(),
                                                            gfx::Rect(),
                                                            1.0,
                                                            0,
                                                            0,
                                                            Tile::USE_LCD_TEXT);
@@ skipping 422 matching lines @@
 }
 
 // If true, the max tile limit should be applied as bytes; if false,
 // as num_resources_limit.
 INSTANTIATE_TEST_CASE_P(TileManagerTests,
                         TileManagerTest,
                         ::testing::Values(true, false));
 
 }  // namespace
 }  // namespace cc