Update animation when changes in animation keyframes are detected.

Source/core/css/CSSKeyframeRule.h

 /*
  * 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 48 matching lines @@
     const StylePropertySet& properties() const { return *m_properties; }
     MutableStylePropertySet& mutableProperties();
     void setProperties(PassRefPtrWillBeRawPtr<StylePropertySet>);
 
     String cssText() const;
 
     void trace(Visitor*);
 
     static PassOwnPtr<Vector<double> > createKeyList(CSSParserValueList*);
 
+    bool operator== (const StyleKeyframe& other) const { return keys() == keys() && cssText() == other.cssText(); }
+
 private:
     StyleKeyframe();
 
     RefPtrWillBeMember<StylePropertySet> m_properties;
     Vector<double> m_keys;
 };
 
 class CSSKeyframeRule final : public CSSRule {
     DEFINE_WRAPPERTYPEINFO();
 public:
@@ skipping 18 matching lines @@
     mutable RefPtrWillBeMember<StyleRuleCSSStyleDeclaration> m_propertiesCSSOMWrapper;
 
     friend class CSSKeyframesRule;
 };
 
 DEFINE_CSS_RULE_TYPE_CASTS(CSSKeyframeRule, KEYFRAME_RULE);
 
 } // namespace blink
 
 #endif // CSSKeyframeRule_h