Revert of Use element id's for animations

third_party/WebKit/Source/platform/scroll/ScrollAnimator.cpp

 /*
  * Copyright (c) 2011, 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 342 matching lines @@
                 compositorOffsetFromBlinkOffset(m_targetOffset));
         }
 
         if (m_runState == RunState::WaitingToCancelOnCompositorButNewScroll)
             m_animationCurve->setInitialValue(compositorOffsetFromBlinkOffset(currentPosition()));
 
         m_runState = RunState::WaitingToSendToCompositor;
     }
 
     if (m_runState == RunState::WaitingToSendToCompositor) {
-        if (!m_compositorAnimationAttachedToElementId)
+        if (!m_compositorAnimationAttachedToLayerId)
             reattachCompositorPlayerIfNeeded(getScrollableArea()->compositorAnimationTimeline());
 
         if (!m_animationCurve)
             createAnimationCurve();
 
         bool runningOnMainThread = false;
         bool sentToCompositor = sendAnimationToCompositor();
         if (!sentToCompositor) {
             runningOnMainThread = registerAndScheduleAnimation();
             if (runningOnMainThread)
@@ skipping 89 matching lines @@
     }
     return true;
 }
 
 DEFINE_TRACE(ScrollAnimator)
 {
     ScrollAnimatorBase::trace(visitor);
 }
 
 } // namespace blink