CC Animation: Make ElementAnimations a ref-counted object.

cc/animation/element_animations.cc

 // Copyright 2015 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/animation/element_animations.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_player.h"
 #include "cc/trees/mutator_host_client.h"
 
 namespace cc {
 
-std::unique_ptr<ElementAnimations> ElementAnimations::Create(
+scoped_refptr<ElementAnimations> ElementAnimations::Create(
     AnimationHost* host) {
-  return base::WrapUnique(new ElementAnimations(host));
+  return make_scoped_refptr(new ElementAnimations(host));
 }
 
 ElementAnimations::ElementAnimations(AnimationHost* host)
     : players_list_(new PlayersList()), animation_host_(host) {
   DCHECK(animation_host_);
 }
 
 ElementAnimations::~ElementAnimations() {
   DCHECK(!layer_animation_controller_);
 }
@@ skipping 68 matching lines @@
       return;
     }
   }
 }
 
 bool ElementAnimations::IsEmpty() const {
   return players_list_->empty();
 }
 
 void ElementAnimations::PushPropertiesTo(
-    ElementAnimations* element_animations_impl) {
+    scoped_refptr<ElementAnimations> element_animations_impl) {
   DCHECK(layer_animation_controller_);
   DCHECK(element_animations_impl->layer_animation_controller_);
 
   layer_animation_controller_->PushAnimationUpdatesTo(
       element_animations_impl->layer_animation_controller_.get());
 }
 
 void ElementAnimations::AddAnimation(std::unique_ptr<Animation> animation) {
   layer_animation_controller_->AddAnimation(std::move(animation));
 }
@@ skipping 67 matching lines @@
     LayerTreeType tree_type,
     const gfx::ScrollOffset& scroll_offset) {
   DCHECK(layer_id());
   DCHECK(animation_host());
   DCHECK(animation_host()->mutator_host_client());
   animation_host()->mutator_host_client()->SetLayerScrollOffsetMutated(
       layer_id(), tree_type, scroll_offset);
 }
 
 void ElementAnimations::OnAnimationWaitingForDeletion() {
-  // TODO(loyso): See Layer::OnAnimationWaitingForDeletion. But we always do
-  // PushProperties for AnimationTimelines for now.
+  // TODO(loyso): Invalidate AnimationHost::SetNeedsPushProperties here.
+  // But we always do PushProperties in AnimationHost for now. crbug.com/604280
 }
 
 void ElementAnimations::OnTransformIsPotentiallyAnimatingChanged(
     LayerTreeType tree_type,
     bool is_animating) {
   DCHECK(layer_id());
   DCHECK(animation_host());
   DCHECK(animation_host()->mutator_host_client());
   animation_host()
       ->mutator_host_client()
@@ skipping 77 matching lines @@
   if (animation_host()) {
     DCHECK(animation_host()->mutator_host_client());
     return animation_host()->mutator_host_client()->GetScrollOffsetForAnimation(
         layer_id());
   }
 
   return gfx::ScrollOffset();
 }
 
 }  // namespace cc