Update animation when changes in animation keyframes are detected.

Source/core/animation/AnimationNode.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 42 matching lines @@
 
 AnimationNode::AnimationNode(const Timing& timing, PassOwnPtrWillBeRawPtr<EventDelegate> eventDelegate)
     : m_parent(nullptr)
     , m_startTime(0)
     , m_player(nullptr)
     , m_timing(timing)
     , m_eventDelegate(eventDelegate)
     , m_calculated()
     , m_needsUpdate(true)
     , m_lastUpdateTime(nullValue())
+    , m_styleChangeCounter(0)
 {
     m_timing.assertValid();
 }
 
 double AnimationNode::iterationDuration() const
 {
     double result = std::isnan(m_timing.iterationDuration) ? intrinsicIterationDuration() : m_timing.iterationDuration;
     ASSERT(result >= 0);
     return result;
 }
@@ skipping 154 matching lines @@
 }
 
 void AnimationNode::trace(Visitor* visitor)
 {
     visitor->trace(m_parent);
     visitor->trace(m_player);
     visitor->trace(m_eventDelegate);
 }
 
 } // namespace blink