CC Animation: Use ElementId to attach CC animation players.

third_party/WebKit/Source/platform/animation/CompositorAnimationPlayer.h

 // Copyright 2016 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 CompositorAnimationPlayer_h
 #define CompositorAnimationPlayer_h
 
 #include "base/memory/ref_counted.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_curve.h"
 #include "cc/animation/animation_delegate.h"
 #include "cc/animation/animation_player.h"
 #include "platform/PlatformExport.h"
+#include "platform/graphics/CompositorElementId.h"
 #include "wtf/Noncopyable.h"
 
 #include <memory>
 
 namespace blink {
 
 class CompositorAnimation;
 class CompositorAnimationDelegate;
 class WebLayer;
 
 // A compositor representation for AnimationPlayer.
 class PLATFORM_EXPORT CompositorAnimationPlayer : public cc::AnimationDelegate {
     WTF_MAKE_NONCOPYABLE(CompositorAnimationPlayer);
 public:
     CompositorAnimationPlayer();
     ~CompositorAnimationPlayer();
 
     cc::AnimationPlayer* animationPlayer() const;
 
     // An animation delegate is notified when animations are started and
     // stopped. The CompositorAnimationPlayer does not take ownership of the delegate, and it is
     // the responsibility of the client to reset the layer's delegate before
     // deleting the delegate.
     void setAnimationDelegate(CompositorAnimationDelegate*);
 
-    void attachLayer(WebLayer*);
-    void detachLayer();
-    bool isLayerAttached() const;
+    void attachElement(CompositorElementId);
+    void detachElement();
+    bool isElementAttached() const;
 
     void addAnimation(CompositorAnimation*);
     void removeAnimation(int animationId);
     void pauseAnimation(int animationId, double timeOffset);
     void abortAnimation(int animationId);
 
 private:
     // cc::AnimationDelegate implementation.
     void NotifyAnimationStarted(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
     void NotifyAnimationFinished(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
     void NotifyAnimationAborted(base::TimeTicks monotonicTime, cc::TargetProperty::Type, int group) override;
     void NotifyAnimationTakeover(base::TimeTicks monotonicTime, cc::TargetProperty::Type, double animationStartTime, std::unique_ptr<cc::AnimationCurve>) override;
 
     scoped_refptr<cc::AnimationPlayer> m_animationPlayer;
     CompositorAnimationDelegate* m_delegate;
 };
 
 } // namespace blink
 
 #endif // CompositorAnimationPlayer_h