[#5] Pass gfx structs by const ref (gfx::Vector2dF)

cc/test/animation_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_ANIMATION_TEST_COMMON_H_
 #define CC_TEST_ANIMATION_TEST_COMMON_H_
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 57 matching lines @@
 
 class FakeLayerAnimationValueObserver : public LayerAnimationValueObserver {
  public:
   FakeLayerAnimationValueObserver();
   virtual ~FakeLayerAnimationValueObserver();
 
   // LayerAnimationValueObserver implementation
   virtual void OnFilterAnimated(const FilterOperations& filters) OVERRIDE;
   virtual void OnOpacityAnimated(float opacity) OVERRIDE;
   virtual void OnTransformAnimated(const gfx::Transform& transform) OVERRIDE;
-  virtual void OnScrollOffsetAnimated(gfx::Vector2dF scroll_offset) OVERRIDE;
+  virtual void OnScrollOffsetAnimated(
+      const gfx::Vector2dF& scroll_offset) OVERRIDE;
   virtual void OnAnimationWaitingForDeletion() OVERRIDE;
   virtual bool IsActive() const OVERRIDE;
 
   const FilterOperations& filters() const { return filters_; }
   float opacity() const  { return opacity_; }
   const gfx::Transform& transform() const { return transform_; }
   gfx::Vector2dF scroll_offset() { return scroll_offset_; }
 
   bool animation_waiting_for_deletion() {
     return animation_waiting_for_deletion_;
@@ skipping 10 matching lines @@
 class FakeInactiveLayerAnimationValueObserver
     : public FakeLayerAnimationValueObserver {
  public:
   virtual bool IsActive() const OVERRIDE;
 };
 
 class FakeLayerAnimationValueProvider : public LayerAnimationValueProvider {
  public:
   virtual gfx::Vector2dF ScrollOffsetForAnimation() const OVERRIDE;
 
-  void set_scroll_offset(gfx::Vector2dF scroll_offset) {
+  void set_scroll_offset(const gfx::Vector2dF& scroll_offset) {
     scroll_offset_ = scroll_offset;
   }
 
  private:
   gfx::Vector2dF scroll_offset_;
 };
 
 int AddOpacityTransitionToController(LayerAnimationController* controller,
                                      double duration,
                                      float start_opacity,
@@ skipping 38 matching lines @@
                              float end_brightness);
 
 int AddAnimatedFilterToLayer(LayerImpl* layer,
                              double duration,
                              float start_brightness,
                              float end_brightness);
 
 }  // namespace cc
 
 #endif  // CC_TEST_ANIMATION_TEST_COMMON_H_