CC Animation: Let MutatorHostClient deals with elements instead of layers.

cc/animation/animation_player.h

 // 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.
 
 #ifndef CC_ANIMATION_ANIMATION_PLAYER_H_
 #define CC_ANIMATION_ANIMATION_PLAYER_H_
 
 #include <vector>
 
 #include "base/containers/linked_list.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/element_animations.h"
 #include "cc/base/cc_export.h"
 
 namespace cc {
 
 class AnimationDelegate;
 class AnimationHost;
 class AnimationTimeline;
 class ElementAnimations;
-enum class LayerTreeType;
+enum class ElementListType;
 
 // An AnimationPlayer owns all animations to be run on particular CC Layer.
 // Multiple AnimationPlayers can be attached to one layer. In this case,
 // they share common ElementAnimations so the
 // ElementAnimations-to-Layer relationship is 1:1.
 // For now, the blink logic is responsible for handling of conflicting
 // same-property animations.
 // Each AnimationPlayer has its copy on the impl thread.
 // This is a CC counterpart for blink::AnimationPlayer (in 1:1 relationship).
 class CC_EXPORT AnimationPlayer : public base::RefCounted<AnimationPlayer>,
@@ skipping 86 matching lines @@
 
   int id_;
   ElementId element_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationPlayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_PLAYER_H_