Make CSS Animations responsive to changes to their keyframe offsets

third_party/WebKit/Source/core/css/CSSKeyframeRule.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 32 matching lines @@
 CSSKeyframeRule::~CSSKeyframeRule()
 {
 #if !ENABLE(OILPAN)
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->clearParentRule();
 #endif
 }
 
 void CSSKeyframeRule::setKeyText(const String& keyText, ExceptionState& exceptionState)
 {
+    CSSStyleSheet::RuleMutationScope(this);
+
     if (!m_keyframe->setKeyText(keyText))
         exceptionState.throwDOMException(SyntaxError, "The key '" + keyText + "' is invalid and cannot be parsed");
 
     toCSSKeyframesRule(parentRule())->styleChanged();
 }
 
 CSSStyleDeclaration* CSSKeyframeRule::style() const
 {
     if (!m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper = KeyframeStyleRuleCSSStyleDeclaration::create(m_keyframe->mutableProperties(), const_cast<CSSKeyframeRule*>(this));
     return m_propertiesCSSOMWrapper.get();
 }
 
 void CSSKeyframeRule::reattach(StyleRuleBase*)
 {
     // No need to reattach, the underlying data is shareable on mutation.
     ASSERT_NOT_REACHED();
 }
 
 DEFINE_TRACE(CSSKeyframeRule)
 {
     visitor->trace(m_keyframe);
     visitor->trace(m_propertiesCSSOMWrapper);
     CSSRule::trace(visitor);
 }
 
 } // namespace blink