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diff --git a/Source/WebCore/css/CSSKeyframeRule.cpp b/Source/WebCore/css/CSSKeyframeRule.cpp
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+++ b/Source/WebCore/css/CSSKeyframeRule.cpp
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+/*
+ * Copyright (C) 2007, 2008, 2012, 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 "CSSKeyframeRule.h"
+
+#include "CSSKeyframesRule.h"
+#include "PropertySetCSSStyleDeclaration.h"
+#include "StyleProperties.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+StyleRuleKeyframe::StyleRuleKeyframe(Ref<StyleProperties>&& properties)
+    : StyleRuleBase(Keyframe)
+    , m_properties(WTFMove(properties))
+{
+}
+
+StyleRuleKeyframe::StyleRuleKeyframe(std::unique_ptr<Vector<double>> keys, Ref<StyleProperties>&& properties)
+    : StyleRuleBase(Keyframe)
+    , m_properties(WTFMove(properties))
+    , m_keys(*keys)
+{
+}
+    
+StyleRuleKeyframe::~StyleRuleKeyframe()
+{
+}
+
+MutableStyleProperties& StyleRuleKeyframe::mutableProperties()
+{
+    if (!is<MutableStyleProperties>(m_properties.get()))
+        m_properties = m_properties->mutableCopy();
+    return downcast<MutableStyleProperties>(m_properties.get());
+}
+
+String StyleRuleKeyframe::keyText() const
+{
+    StringBuilder keyText;
+
+    for (size_t i = 0; i < m_keys.size(); ++i) {
+        if (i)
+            keyText.append(',');
+        keyText.appendNumber(m_keys.at(i) * 100);
+        keyText.append('%');
+    }
+
+    return keyText.toString();
+}
+    
+bool StyleRuleKeyframe::setKeyText(const String& keyText)
+{
+    ASSERT(!keyText.isNull());
+    auto keys = CSSParser::parseKeyframeKeyList(keyText);
+    if (!keys || keys->isEmpty())
+        return false;
+    m_keys = *keys;
+    return true;
+}
+
+String StyleRuleKeyframe::cssText() const
+{
+    StringBuilder result;
+    result.append(keyText());
+    result.appendLiteral(" { ");
+    String decls = m_properties->asText();
+    result.append(decls);
+    if (!decls.isEmpty())
+        result.append(' ');
+    result.append('}');
+    return result.toString();
+}
+
+CSSKeyframeRule::CSSKeyframeRule(StyleRuleKeyframe& keyframe, CSSKeyframesRule* parent)
+    : CSSRule(0)
+    , m_keyframe(keyframe)
+{
+    setParentRule(parent);
+}
+
+CSSKeyframeRule::~CSSKeyframeRule()
+{
+    if (m_propertiesCSSOMWrapper)
+        m_propertiesCSSOMWrapper->clearParentRule();
+}
+
+CSSStyleDeclaration& CSSKeyframeRule::style()
+{
+    if (!m_propertiesCSSOMWrapper)
+        m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_keyframe->mutableProperties(), *this);
+    return *m_propertiesCSSOMWrapper;
+}
+
+void CSSKeyframeRule::reattach(StyleRuleBase&)
+{
+    // No need to reattach, the underlying data is shareable on mutation.
+    ASSERT_NOT_REACHED();
+}
+
+} // namespace WebCore