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diff --git a/Source/WebCore/css/CSSKeyframeRule.h b/Source/WebCore/css/CSSKeyframeRule.h
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+++ b/Source/WebCore/css/CSSKeyframeRule.h
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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.
+ */
+
+#pragma once
+
+#include "CSSParser.h"
+#include "CSSRule.h"
+#include "StyleProperties.h"
+#include "StyleRule.h"
+
+namespace WebCore {
+
+class CSSStyleDeclaration;
+class StyleRuleCSSStyleDeclaration;
+class CSSKeyframesRule;
+
+class StyleRuleKeyframe final : public StyleRuleBase {
+public:
+    static Ref<StyleRuleKeyframe> create(Ref<StyleProperties>&& properties)
+    {
+        return adoptRef(*new StyleRuleKeyframe(WTFMove(properties)));
+    }
+
+    static Ref<StyleRuleKeyframe> create(std::unique_ptr<Vector<double>> keys, Ref<StyleProperties>&& properties)
+    {
+        return adoptRef(*new StyleRuleKeyframe(WTFMove(keys), WTFMove(properties)));
+    }
+    ~StyleRuleKeyframe();
+
+    String keyText() const;
+    bool setKeyText(const String&);
+    void setKey(double key)
+    {
+        ASSERT(m_keys.isEmpty());
+        m_keys.clear();
+        m_keys.append(key);
+    }
+
+    const Vector<double>& keys() const { return m_keys; };
+
+    const StyleProperties& properties() const { return m_properties; }
+    MutableStyleProperties& mutableProperties();
+
+    String cssText() const;
+
+private:
+    explicit StyleRuleKeyframe(Ref<StyleProperties>&&);
+    StyleRuleKeyframe(std::unique_ptr<Vector<double>>, Ref<StyleProperties>&&);
+
+    Ref<StyleProperties> m_properties;
+    Vector<double> m_keys;
+};
+
+class CSSKeyframeRule final : public CSSRule {
+public:
+    virtual ~CSSKeyframeRule();
+
+    String cssText() const final { return m_keyframe->cssText(); }
+    void reattach(StyleRuleBase&) final;
+
+    String keyText() const { return m_keyframe->keyText(); }
+    void setKeyText(const String& text) { m_keyframe->setKeyText(text); }
+
+    CSSStyleDeclaration& style();
+
+private:
+    CSSKeyframeRule(StyleRuleKeyframe&, CSSKeyframesRule* parent);
+
+    CSSRule::Type type() const final { return KEYFRAME_RULE; }
+
+    Ref<StyleRuleKeyframe> m_keyframe;
+    mutable RefPtr<StyleRuleCSSStyleDeclaration> m_propertiesCSSOMWrapper;
+    
+    friend class CSSKeyframesRule;
+};
+
+} // namespace WebCore