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diff --git a/Source/WebCore/css/CSSVariableReferenceValue.h b/Source/WebCore/css/CSSVariableReferenceValue.h
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+++ b/Source/WebCore/css/CSSVariableReferenceValue.h
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Copyright (C) 2016 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:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * 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.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "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 THE COPYRIGHT
+// OWNER 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 "CSSValue.h"
+#include "CSSVariableData.h"
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class CSSVariableReferenceValue : public CSSValue {
+public:
+    static Ref<CSSVariableReferenceValue> create(Ref<CSSVariableData>&& data)
+    {
+        return adoptRef(*new CSSVariableReferenceValue(WTFMove(data)));
+    }
+
+    CSSVariableData* variableDataValue() const
+    {
+        return m_data.get();
+    }
+
+    bool equals(const CSSVariableReferenceValue& other) const { return m_data == other.m_data; }
+    String customCSSText() const;
+
+    bool checkVariablesForCycles(const AtomicString& name, CustomPropertyValueMap&, HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties) const;
+
+private:
+    CSSVariableReferenceValue(Ref<CSSVariableData>&& data)
+        : CSSValue(VariableReferenceClass)
+        , m_data(WTFMove(data))
+    {
+    }
+
+    RefPtr<CSSVariableData> m_data;
+    mutable String m_stringValue;
+    mutable bool m_serialized { false };
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSVariableReferenceValue, isVariableReferenceValue())