CC Animation: Start replacing int layer_id with ElementId element_id.

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

 // 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.
 
 #include "platform/animation/CompositorAnimationPlayer.h"
 
 #include "cc/animation/animation_id_provider.h"
 #include "cc/animation/animation_timeline.h"
 #include "platform/animation/CompositorAnimation.h"
 #include "platform/animation/CompositorAnimationDelegate.h"
@@ skipping 32 matching lines @@
     m_animationPlayer->AttachLayer(webLayer->id());
 }
 
 void CompositorAnimationPlayer::detachLayer()
 {
     m_animationPlayer->DetachLayer();
 }
 
 bool CompositorAnimationPlayer::isLayerAttached() const
 {
-    return m_animationPlayer->layer_id() != 0;
+    return m_animationPlayer->element_id() != 0;
 }
 
 void CompositorAnimationPlayer::addAnimation(CompositorAnimation* animation)
 {
     m_animationPlayer->AddAnimation(animation->passAnimation());
     delete animation;
 }
 
 void CompositorAnimationPlayer::removeAnimation(int animationId)
 {
@@ skipping 45 matching lines @@
 {
     if (m_delegate) {
         m_delegate->notifyAnimationTakeover(
             (monotonicTime - base::TimeTicks()).InSecondsF(),
             animationStartTime,
             std::move(curve));
     }
 }
 
 } // namespace blink