Implement support for unprefixed keyframes rules resolution.

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 133 matching lines @@
 
 CSSKeyframeRule* CSSKeyframesRule::findRule(const String& s)
 {
     int i = m_keyframesRule->findKeyframeIndex(s);
     return (i >= 0) ? item(i) : 0;
 }
 
 String CSSKeyframesRule::cssText() const
 {
     StringBuilder result;
-    result.append("@-webkit-keyframes ");
+    if (isVendorPrefixed())
+        result.append("@-webkit-keyframes ");
+    else
+        result.append("@keyframes ");
     result.append(name());
     result.append(" { \n");
 
     unsigned size = length();
     for (unsigned i = 0; i < size; ++i) {
         result.append("  ");
         result.append(m_keyframesRule->keyframes()[i]->cssText());
         result.append("\n");
     }
     result.append("}");
@@ skipping 26 matching lines @@
 }
 
 void CSSKeyframesRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     ASSERT_WITH_SECURITY_IMPLICATION(rule->isKeyframesRule());
     m_keyframesRule = static_cast<StyleRuleKeyframes*>(rule);
 }
 
 } // namespace WebCore