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diff --git a/Source/WebCore/css/CSSCustomPropertyValue.h b/Source/WebCore/css/CSSCustomPropertyValue.h
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+++ b/Source/WebCore/css/CSSCustomPropertyValue.h
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+/*
+ * Copyright (C) 2015 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 "CSSValue.h"
+#include "CSSVariableData.h"
+#include <wtf/RefPtr.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class CSSCustomPropertyValue final : public CSSValue {
+public:
+    static Ref<CSSCustomPropertyValue> createWithVariableData(const AtomicString& name, Ref<CSSVariableData>&& value)
+    {
+        return adoptRef(*new CSSCustomPropertyValue(name, WTFMove(value)));
+    }
+    
+    static Ref<CSSCustomPropertyValue> createWithID(const AtomicString& name, CSSValueID value)
+    {
+        return adoptRef(*new CSSCustomPropertyValue(name, value));
+    }
+    
+    static Ref<CSSCustomPropertyValue> createInvalid()
+    {
+        return adoptRef(*new CSSCustomPropertyValue(emptyString(), emptyString()));
+    }
+    
+    String customCSSText() const
+    {
+        if (!m_serialized) {
+            m_serialized = true;
+            if (m_value)
+                m_stringValue = m_value->tokenRange().serialize();
+            else if (m_valueId != CSSValueInvalid)
+                m_stringValue = getValueName(m_valueId);
+            else
+                m_stringValue = emptyString();
+        }
+        return m_stringValue;
+    }
+
+    const AtomicString& name() const { return m_name; }
+    
+    bool equals(const CSSCustomPropertyValue& other) const { return m_name == other.m_name && m_value == other.m_value && m_valueId == other.m_valueId; }
+
+    bool containsVariables() const { return m_containsVariables; }
+    bool checkVariablesForCycles(const AtomicString& name, CustomPropertyValueMap&, HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties) const;
+
+    void resolveVariableReferences(const CustomPropertyValueMap&, Vector<Ref<CSSCustomPropertyValue>>&) const;
+
+    CSSValueID valueID() const { return m_valueId; }
+    CSSVariableData* value() const { return m_value.get(); }
+
+private:
+    CSSCustomPropertyValue(const AtomicString& name, const String& serializedValue)
+        : CSSValue(CustomPropertyClass)
+        , m_name(name)
+        , m_stringValue(serializedValue)
+        , m_serialized(true)
+    {
+    }
+
+    CSSCustomPropertyValue(const AtomicString& name, CSSValueID id)
+        : CSSValue(CustomPropertyClass)
+        , m_name(name)
+        , m_valueId(id)
+    {
+        ASSERT(id == CSSValueInherit || id == CSSValueInitial || id == CSSValueUnset || id == CSSValueRevert || id == CSSValueInvalid);
+    }
+    
+    CSSCustomPropertyValue(const AtomicString& name, Ref<CSSVariableData>&& value)
+        : CSSValue(CustomPropertyClass)
+        , m_name(name)
+        , m_value(WTFMove(value))
+        , m_valueId(CSSValueInternalVariableValue)
+        , m_containsVariables(m_value->needsVariableResolution())
+    {
+    }
+    
+    const AtomicString m_name;
+    
+    RefPtr<CSSVariableData> m_value;
+    CSSValueID m_valueId { CSSValueInvalid };
+    
+    mutable String m_stringValue;
+    bool m_containsVariables { false };
+    mutable bool m_serialized { false };
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSCustomPropertyValue, isCustomPropertyValue())