CC Animation: Use ElementId to attach CC animation players.

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 298 matching lines @@
         m_compositorAnimationGroupId = 0;
 
         m_animationCurve->updateTarget(m_timeFunction() - m_startTime,
             compositorOffsetFromBlinkOffset(m_targetOffset));
         if (m_runState == RunState::WaitingToCancelOnCompositorButNewScroll)
             m_animationCurve->setInitialValue(compositorOffsetFromBlinkOffset(currentPosition()));
         m_runState = RunState::WaitingToSendToCompositor;
     }
 
     if (m_runState == RunState::WaitingToSendToCompositor) {
-        if (!m_compositorAnimationAttachedToLayerId)
+        if (!m_compositorAnimationAttachedToElementId)
             reattachCompositorPlayerIfNeeded(getScrollableArea()->compositorAnimationTimeline());
 
         if (!m_animationCurve) {
             m_animationCurve = adoptPtr(CompositorFactory::current().createScrollOffsetAnimationCurve(
                 compositorOffsetFromBlinkOffset(m_targetOffset),
                 CompositorAnimationCurve::TimingFunctionTypeEaseInOut,
                 m_lastGranularity == ScrollByPixel ?
                     CompositorScrollOffsetAnimationCurve::ScrollDurationInverseDelta :
                     CompositorScrollOffsetAnimationCurve::ScrollDurationConstant));
             m_animationCurve->setInitialValue(compositorOffsetFromBlinkOffset(currentPosition()));
@@ skipping 96 matching lines @@
     }
     return true;
 }
 
 DEFINE_TRACE(ScrollAnimator)
 {
     ScrollAnimatorBase::trace(visitor);
 }
 
 } // namespace blink