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diff --git a/Source/WebCore/css/CSSKeyframesRule.cpp b/Source/WebCore/css/CSSKeyframesRule.cpp
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+++ b/Source/WebCore/css/CSSKeyframesRule.cpp
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+/*
+ * Copyright (C) 2007, 2008, 2012, 2013, 2014 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "CSSKeyframesRule.h"
+
+#include "CSSDeferredParser.h"
+#include "CSSKeyframeRule.h"
+#include "CSSParser.h"
+#include "CSSRuleList.h"
+#include "CSSStyleSheet.h"
+#include "Document.h"
+#include "StyleProperties.h"
+#include "StyleSheet.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+StyleRuleKeyframes::StyleRuleKeyframes(const AtomicString& name)
+    : StyleRuleBase(Keyframes)
+    , m_name(name)
+{
+}
+
+StyleRuleKeyframes::StyleRuleKeyframes(const AtomicString& name, std::unique_ptr<DeferredStyleGroupRuleList>&& deferredRules)
+    : StyleRuleBase(Keyframes)
+    , m_name(name)
+    , m_deferredRules(WTFMove(deferredRules))
+{
+    
+}
+
+StyleRuleKeyframes::StyleRuleKeyframes(const StyleRuleKeyframes& o)
+    : StyleRuleBase(o)
+    , m_name(o.m_name)
+{
+    m_keyframes.reserveInitialCapacity(o.keyframes().size());
+    for (auto& keyframe : o.keyframes())
+        m_keyframes.uncheckedAppend(keyframe.copyRef());
+}
+
+StyleRuleKeyframes::~StyleRuleKeyframes()
+{
+}
+
+void StyleRuleKeyframes::parseDeferredRulesIfNeeded() const
+{
+    if (!m_deferredRules)
+        return;
+    
+    m_deferredRules->parseDeferredKeyframes(const_cast<StyleRuleKeyframes&>(*this));
+    m_deferredRules = nullptr;
+}
+
+const Vector<Ref<StyleRuleKeyframe>>& StyleRuleKeyframes::keyframes() const
+{
+    parseDeferredRulesIfNeeded();
+    return m_keyframes;
+}
+
+void StyleRuleKeyframes::parserAppendKeyframe(RefPtr<StyleRuleKeyframe>&& keyframe)
+{
+    if (!keyframe)
+        return;
+    m_keyframes.append(keyframe.releaseNonNull());
+}
+
+void StyleRuleKeyframes::wrapperAppendKeyframe(Ref<StyleRuleKeyframe>&& keyframe)
+{
+    parseDeferredRulesIfNeeded();
+    m_keyframes.append(WTFMove(keyframe));
+}
+
+void StyleRuleKeyframes::wrapperRemoveKeyframe(unsigned index)
+{
+    parseDeferredRulesIfNeeded();
+    m_keyframes.remove(index);
+}
+
+size_t StyleRuleKeyframes::findKeyframeIndex(const String& key) const
+{
+    parseDeferredRulesIfNeeded();
+
+    auto keys = CSSParser::parseKeyframeKeyList(key);
+
+    if (!keys)
+        return notFound;
+
+    for (size_t i = m_keyframes.size(); i--; ) {
+        if (m_keyframes[i]->keys() == *keys)
+            return i;
+    }
+
+    return notFound;
+}
+
+CSSKeyframesRule::CSSKeyframesRule(StyleRuleKeyframes& keyframesRule, CSSStyleSheet* parent)
+    : CSSRule(parent)
+    , m_keyframesRule(keyframesRule)
+    , m_childRuleCSSOMWrappers(keyframesRule.keyframes().size())
+{
+}
+
+CSSKeyframesRule::~CSSKeyframesRule()
+{
+    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
+
+    for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
+        if (m_childRuleCSSOMWrappers[i])
+            m_childRuleCSSOMWrappers[i]->setParentRule(0);
+    }
+}
+
+void CSSKeyframesRule::setName(const String& name)
+{
+    CSSStyleSheet::RuleMutationScope mutationScope(this);
+
+    m_keyframesRule->setName(name);
+}
+
+void CSSKeyframesRule::appendRule(const String& ruleText)
+{
+    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
+
+    CSSParser parser(parserContext());
+    RefPtr<StyleRuleKeyframe> keyframe = parser.parseKeyframeRule(ruleText);
+    if (!keyframe)
+        return;
+
+    CSSStyleSheet::RuleMutationScope mutationScope(this);
+
+    m_keyframesRule->wrapperAppendKeyframe(keyframe.releaseNonNull());
+
+    m_childRuleCSSOMWrappers.grow(length());
+}
+
+void CSSKeyframesRule::insertRule(const String& ruleText)
+{
+    if (CSSStyleSheet* parent = parentStyleSheet()) {
+        if (Document* ownerDocument = parent->ownerDocument())
+            ownerDocument->addConsoleMessage(MessageSource::JS, MessageLevel::Warning, ASCIILiteral("CSSKeyframesRule 'insertRule' function is deprecated.  Use 'appendRule' instead."));
+    }
+    appendRule(ruleText);
+}
+
+void CSSKeyframesRule::deleteRule(const String& s)
+{
+    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
+
+    size_t i = m_keyframesRule->findKeyframeIndex(s);
+    if (i == notFound)
+        return;
+
+    CSSStyleSheet::RuleMutationScope mutationScope(this);
+
+    m_keyframesRule->wrapperRemoveKeyframe(i);
+
+    if (m_childRuleCSSOMWrappers[i])
+        m_childRuleCSSOMWrappers[i]->setParentRule(0);
+    m_childRuleCSSOMWrappers.remove(i);
+}
+
+CSSKeyframeRule* CSSKeyframesRule::findRule(const String& s)
+{
+    size_t i = m_keyframesRule->findKeyframeIndex(s);
+    return i != notFound ? item(i) : nullptr;
+}
+
+String CSSKeyframesRule::cssText() const
+{
+    StringBuilder result;
+    result.appendLiteral("@-webkit-keyframes ");
+    result.append(name());
+    result.appendLiteral(" { \n");
+
+    unsigned size = length();
+    for (unsigned i = 0; i < size; ++i) {
+        result.appendLiteral("  ");
+        result.append(m_keyframesRule->keyframes()[i]->cssText());
+        result.append('\n');
+    }
+    result.append('}');
+    return result.toString();
+}
+
+unsigned CSSKeyframesRule::length() const
+{ 
+    return m_keyframesRule->keyframes().size(); 
+}
+
+CSSKeyframeRule* CSSKeyframesRule::item(unsigned index) const
+{ 
+    if (index >= length())
+        return nullptr;
+    ASSERT(m_childRuleCSSOMWrappers.size() == m_keyframesRule->keyframes().size());
+    auto& rule = m_childRuleCSSOMWrappers[index];
+    if (!rule)
+        rule = adoptRef(*new CSSKeyframeRule(m_keyframesRule->keyframes()[index], const_cast<CSSKeyframesRule*>(this)));
+    return rule.get(); 
+}
+
+CSSRuleList& CSSKeyframesRule::cssRules()
+{
+    if (!m_ruleListCSSOMWrapper)
+        m_ruleListCSSOMWrapper = std::make_unique<LiveCSSRuleList<CSSKeyframesRule>>(*this);
+    return *m_ruleListCSSOMWrapper;
+}
+
+void CSSKeyframesRule::reattach(StyleRuleBase& rule)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(rule.isKeyframesRule());
+    m_keyframesRule = static_cast<StyleRuleKeyframes&>(rule);
+}
+
+} // namespace WebCore