Add a counter for CSSKeyframesRule's anonymous indexed getter

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 177 matching lines @@
         return 0;
 
     ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
     RefPtrWillBeMember<CSSKeyframeRule>& rule = m_childRuleCSSOMWrappers[index];
     if (!rule)
         rule = adoptRefWillBeNoop(new CSSKeyframeRule(m_keyframesRule->keyframes()[index].get(), const_cast<CSSKeyframesRule*>(this)));
 
     return rule.get();
 }
 
+CSSKeyframeRule* CSSKeyframesRule::anonymousIndexedGetter(unsigned index) const
+{
+    if (UseCounter* useCounter = UseCounter::getFrom(parentStyleSheet()))
+        useCounter->count(UseCounter::CSSKeyframesRuleAnonymousIndexedGetter);
+    return item(index);
+}
+
 CSSRuleList* CSSKeyframesRule::cssRules() const
 {
     if (!m_ruleListCSSOMWrapper)
         m_ruleListCSSOMWrapper = LiveCSSRuleList<CSSKeyframesRule>::create(const_cast<CSSKeyframesRule*>(this));
     return m_ruleListCSSOMWrapper.get();
 }
 
 void CSSKeyframesRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     m_keyframesRule = toStyleRuleKeyframes(rule);
 }
 
 DEFINE_TRACE(CSSKeyframesRule)
 {
     CSSRule::trace(visitor);
 #if ENABLE(OILPAN)
     visitor->trace(m_childRuleCSSOMWrappers);
 #endif
     visitor->trace(m_keyframesRule);
     visitor->trace(m_ruleListCSSOMWrapper);
 }
 
 } // namespace blink