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

cc/test/tiled_layer_test_common.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_TEST_TILED_LAYER_TEST_COMMON_H_
 #define CC_TEST_TILED_LAYER_TEST_COMMON_H_
 
 #include "cc/base/region.h"
 #include "cc/layers/tiled_layer.h"
 #include "cc/layers/tiled_layer_impl.h"
@@ skipping 28 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(Resource);
   };
 
   FakeLayerUpdater();
 
   virtual scoped_ptr<LayerUpdater::Resource> CreateResource(
       PrioritizedResourceManager* resource) OVERRIDE;
 
   virtual void PrepareToUpdate(const gfx::Rect& content_rect,
-                               gfx::Size tile_size,
+                               const gfx::Size& tile_size,
                                float contents_width_scale,
                                float contents_height_scale,
                                gfx::Rect* resulting_opaque_rect) OVERRIDE;
   // Sets the rect to invalidate during the next call to PrepareToUpdate().
   // After the next call to PrepareToUpdate() the rect is reset.
   void SetRectToInvalidate(const gfx::Rect& rect, FakeTiledLayer* layer);
   // Last rect passed to PrepareToUpdate().
   gfx::Rect last_update_rect() const { return last_update_rect_; }
 
   // Number of times PrepareToUpdate has been invoked.
@@ skipping 72 matching lines @@
   gfx::RectF last_needs_display_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeTiledLayer);
 };
 
 class FakeTiledLayerWithScaledBounds : public FakeTiledLayer {
  public:
   explicit FakeTiledLayerWithScaledBounds(
       PrioritizedResourceManager* resource_manager);
 
-  void SetContentBounds(gfx::Size content_bounds);
+  void SetContentBounds(const gfx::Size& content_bounds);
   virtual void CalculateContentsScale(float ideal_contents_scale,
                                       float device_scale_factor,
                                       float page_scale_factor,
                                       bool animating_transform_to_screen,
                                       float* contents_scale_x,
                                       float* contents_scale_y,
                                       gfx::Size* content_bounds) OVERRIDE;
 
  protected:
   virtual ~FakeTiledLayerWithScaledBounds();
   gfx::Size forced_content_bounds_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FakeTiledLayerWithScaledBounds);
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TILED_LAYER_TEST_COMMON_H_