Revert of Use element id's for animations

third_party/WebKit/Source/core/animation/Animation.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 931 matching lines @@
 }
 
 void Animation::attachCompositedLayers()
 {
     if (!m_compositorPlayer)
         return;
 
     ASSERT(m_content);
     ASSERT(m_content->isKeyframeEffect());
 
-    toKeyframeEffect(m_content.get())->attachCompositedLayers();
+    if (toKeyframeEffect(m_content.get())->canAttachCompositedLayers())
+        toKeyframeEffect(m_content.get())->attachCompositedLayers();
 }
 
 void Animation::detachCompositedLayers()
 {
-    if (m_compositorPlayer && m_compositorPlayer->isElementAttached())
-        m_compositorPlayer->detachElement();
+    if (m_compositorPlayer && m_compositorPlayer->isLayerAttached())
+        m_compositorPlayer->detachLayer();
 }
 
 void Animation::notifyAnimationStarted(double monotonicTime, int group)
 {
     timeline()->document()->compositorPendingAnimations().notifyCompositorAnimationStarted(monotonicTime, group);
 }
 
 Animation::PlayStateUpdateScope::PlayStateUpdateScope(Animation& animation, TimingUpdateReason reason, CompositorPendingChange compositorPendingChange)
     : m_animation(animation)
     , m_initialPlayState(m_animation->playStateInternal())
@@ skipping 115 matching lines @@
     visitor->trace(m_timeline);
     visitor->trace(m_pendingFinishedEvent);
     visitor->trace(m_pendingCancelledEvent);
     visitor->trace(m_finishedPromise);
     visitor->trace(m_readyPromise);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink