Update animation when changes in animation keyframes are detected.

Source/core/css/CSSKeyframesRule.cpp

 /*
  * Copyright (C) 2007, 2008, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "core/css/CSSRuleList.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/frame/UseCounter.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 StyleRuleKeyframes::StyleRuleKeyframes()
     : StyleRuleBase(Keyframes)
+    , m_styleChangeCounter(0)
 {
 }
 
 StyleRuleKeyframes::StyleRuleKeyframes(const StyleRuleKeyframes& o)
     : StyleRuleBase(o)
     , m_keyframes(o.m_keyframes)
     , m_name(o.m_name)
     , m_isPrefixed(o.m_isPrefixed)
+    , m_styleChangeCounter(o.m_styleChangeCounter)
 {
 }
 
 StyleRuleKeyframes::~StyleRuleKeyframes()
 {
 }
 
 void StyleRuleKeyframes::parserAppendKeyframe(PassRefPtrWillBeRawPtr<StyleRuleKeyframe> keyframe)
 {
     if (!keyframe)
@@ skipping 150 matching lines @@
 {
     CSSRule::trace(visitor);
 #if ENABLE(OILPAN)
     visitor->trace(m_childRuleCSSOMWrappers);
 #endif
     visitor->trace(m_keyframesRule);
     visitor->trace(m_ruleListCSSOMWrapper);
 }
 
 } // namespace blink