Revert "Make compositingState explicit (re-land #2 with bogus ASSERT removed)"

Source/core/frame/animation/KeyframeAnimation.cpp

 /*
  * Copyright (C) 2007, 2012 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 221 matching lines @@
     }
 }
 
 bool KeyframeAnimation::hasAnimationForProperty(CSSPropertyID property) const
 {
     return m_keyframes.containsProperty(property);
 }
 
 void KeyframeAnimation::startAnimation(double timeOffset)
 {
-    if (m_object && m_object->compositingState() == PaintsIntoOwnBacking)
+    if (m_object && m_object->isComposited())
         m_isAccelerated = toRenderBoxModelObject(m_object)->startAnimation(timeOffset, m_animation.get(), m_keyframes);
 }
 
 void KeyframeAnimation::pauseAnimation(double timeOffset)
 {
     if (!m_object)
         return;
 
-    if (m_object && m_object->compositingState() == PaintsIntoOwnBacking && isAccelerated())
+    if (m_object && m_object->isComposited() && isAccelerated())
         toRenderBoxModelObject(m_object)->animationPaused(timeOffset, m_keyframes.animationName());
 
     // Restore the original (unanimated) style
     if (!paused())
         setNeedsStyleRecalc(m_object->node());
 }
 
 void KeyframeAnimation::endAnimation()
 {
     if (!m_object)
         return;
 
-    if (m_object && m_object->compositingState() == PaintsIntoOwnBacking && isAccelerated())
+    if (m_object && m_object->isComposited() && isAccelerated())
         toRenderBoxModelObject(m_object)->animationFinished(m_keyframes.animationName());
     m_isAccelerated = false;
 
     // Restore the original (unanimated) style
     if (!paused())
         setNeedsStyleRecalc(m_object->node());
 }
 
 bool KeyframeAnimation::shouldSendEventForListener(Document::ListenerType listenerType) const
 {
@@ skipping 177 matching lines @@
 
     if (acceleratedPropertiesOnly) {
         bool isLooping;
         getTimeToNextEvent(t, isLooping);
     }
 
     return t;
 }
 
 } // namespace WebCore