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_version(0)
 {
 }
 
 StyleRuleKeyframes::StyleRuleKeyframes(const StyleRuleKeyframes& o)
     : StyleRuleBase(o)
     , m_keyframes(o.m_keyframes)
     , m_name(o.m_name)
+    , m_version(o.m_version)
     , m_isPrefixed(o.m_isPrefixed)
 {
 }
 
 StyleRuleKeyframes::~StyleRuleKeyframes()
 {
 }
 
 void StyleRuleKeyframes::parserAppendKeyframe(PassRefPtrWillBeRawPtr<StyleRuleKeyframe> keyframe)
 {
     if (!keyframe)
         return;
     m_keyframes.append(keyframe);
 }
 
 void StyleRuleKeyframes::wrapperAppendKeyframe(PassRefPtrWillBeRawPtr<StyleRuleKeyframe> keyframe)
 {
     m_keyframes.append(keyframe);
+    styleChanged();
 }
 
 void StyleRuleKeyframes::wrapperRemoveKeyframe(unsigned index)
 {
     m_keyframes.remove(index);
+    styleChanged();
 }
 
 int StyleRuleKeyframes::findKeyframeIndex(const String& key) const
 {
     OwnPtr<Vector<double>> keys = CSSParser::parseKeyframeKeyList(key);
     if (!keys)
         return -1;
     for (size_t i = m_keyframes.size(); i--; ) {
         if (m_keyframes[i]->keys() == *keys)
             return i;
@@ skipping 128 matching lines @@
 {
     CSSRule::trace(visitor);
 #if ENABLE(OILPAN)
     visitor->trace(m_childRuleCSSOMWrappers);
 #endif
     visitor->trace(m_keyframesRule);
     visitor->trace(m_ruleListCSSOMWrapper);
 }
 
 } // namespace blink