Update animation when changes in animation keyframes are detected.

Source/core/css/resolver/ScopedStyleResolver.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 87 matching lines @@
     KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(animationName);
     if (it == m_keyframesRuleMap.end())
         return 0;
 
     return it->value.get();
 }
 
 void ScopedStyleResolver::addKeyframeStyle(PassRefPtrWillBeRawPtr<StyleRuleKeyframes> rule)
 {
     AtomicString s(rule->name());
+
+    KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(s.impl());
+    if (it == m_keyframesRuleMap.end() || !(*rule == *it->value))

[dstockwell, 2014/12/29 23:16:33]

It shouldn't matter to set styleChanged even when `*rule == *it->value`, it's
only a minor optimization to avoid it.

[shend, 2014/12/30 00:03:40]

Done.

+        rule->styleChanged();
+
     if (rule->isVendorPrefixed()) {
-        KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(rule->name().impl());
         if (it == m_keyframesRuleMap.end())
             m_keyframesRuleMap.set(s.impl(), rule);
         else if (it->value->isVendorPrefixed())
             m_keyframesRuleMap.set(s.impl(), rule);
     } else {
         m_keyframesRuleMap.set(s.impl(), rule);
     }
 }
 
 void ScopedStyleResolver::collectMatchingAuthorRules(ElementRuleCollector& collector, bool includeEmptyRules, CascadeScope cascadeScope, CascadeOrder cascadeOrder)
@@ skipping 39 matching lines @@
 void ScopedStyleResolver::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_scope);
     visitor->trace(m_authorStyleSheets);
     visitor->trace(m_keyframesRuleMap);
 #endif
 }
 
 } // namespace blink