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

cc/test/animation_test_common.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/test/animation_test_common.h"
 
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/animation/transform_operations.h"
@@ skipping 182 matching lines @@
 void FakeLayerAnimationValueObserver::OnOpacityAnimated(float opacity) {
   opacity_ = opacity;
 }
 
 void FakeLayerAnimationValueObserver::OnTransformAnimated(
     const gfx::Transform& transform) {
   transform_ = transform;
 }
 
 void FakeLayerAnimationValueObserver::OnScrollOffsetAnimated(
-    gfx::Vector2dF scroll_offset) {
+    const gfx::Vector2dF& scroll_offset) {
   scroll_offset_ = scroll_offset;
 }
 
 void FakeLayerAnimationValueObserver::OnAnimationWaitingForDeletion() {
   animation_waiting_for_deletion_ = true;
 }
 
 bool FakeLayerAnimationValueObserver::IsActive() const {
   return true;
 }
@@ skipping 94 matching lines @@
                              double duration,
                              float start_brightness,
                              float end_brightness) {
   return AddAnimatedFilter(layer->layer_animation_controller(),
                            duration,
                            start_brightness,
                            end_brightness);
 }
 
 }  // namespace cc