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diff --git a/Source/WebCore/css/DeprecatedCSSOMValue.h b/Source/WebCore/css/DeprecatedCSSOMValue.h
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+/*
+ * 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:
+ * 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 "ExceptionOr.h"
+#include <wtf/HashMap.h>
+#include <wtf/ListHashSet.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+#include <wtf/TypeCasts.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class DeprecatedCSSOMValue : public RefCounted<DeprecatedCSSOMValue> {
+public:
+    // Exactly match the IDL. No reason to add anything if it's not in the IDL.
+    enum Type {
+        CSS_INHERIT = 0,
+        CSS_PRIMITIVE_VALUE = 1,
+        CSS_VALUE_LIST = 2,
+        CSS_CUSTOM = 3
+    };
+
+    // Override RefCounted's deref() to ensure operator delete is called on
+    // the appropriate subclass type.
+    void deref()
+    {
+        if (derefBase())
+            destroy();
+    }
+
+    WEBCORE_EXPORT unsigned cssValueType() const;
+
+    WEBCORE_EXPORT String cssText() const;
+    ExceptionOr<void> setCssText(const String&) { return { }; } // Will never implement.
+
+    bool equals(const DeprecatedCSSOMValue& other) const;
+    bool operator==(const DeprecatedCSSOMValue& other) const { return equals(other); }
+
+    bool isComplexValue() const { return m_classType == DeprecatedComplexValueClass; }
+    bool isPrimitiveValue() const { return m_classType == DeprecatedPrimitiveValueClass; }
+    bool isValueList() const { return m_classType == DeprecatedValueListClass; }
+    
+protected:
+    static const size_t ClassTypeBits = 2;
+    enum DeprecatedClassType {
+        DeprecatedComplexValueClass,
+        DeprecatedPrimitiveValueClass,
+        DeprecatedValueListClass
+    };
+
+    DeprecatedClassType classType() const { return static_cast<DeprecatedClassType>(m_classType); }
+
+    DeprecatedCSSOMValue(DeprecatedClassType classType)
+        : m_classType(classType)
+    {
+    }
+
+    // NOTE: This class is non-virtual for memory and performance reasons.
+    // Don't go making it virtual again unless you know exactly what you're doing!
+    ~DeprecatedCSSOMValue() { }
+
+private:
+    WEBCORE_EXPORT void destroy();
+
+protected:
+    unsigned m_valueListSeparator : CSSValue::ValueListSeparatorBits;
+
+private:
+    unsigned m_classType : ClassTypeBits; // ClassType
+};
+
+class DeprecatedCSSOMComplexValue : public DeprecatedCSSOMValue {
+public:
+    static Ref<DeprecatedCSSOMComplexValue> create(const CSSValue& value)
+    {
+        return adoptRef(*new DeprecatedCSSOMComplexValue(value));
+    }
+
+    bool equals(const DeprecatedCSSOMComplexValue& other) const { return m_value->equals(other.m_value); }
+    String cssText() const { return m_value->cssText(); }
+
+    unsigned cssValueType() const { return m_value->cssValueType(); }
+
+protected:
+    DeprecatedCSSOMComplexValue(const CSSValue& value)
+        : DeprecatedCSSOMValue(DeprecatedComplexValueClass)
+        , m_value(const_cast<CSSValue&>(value))
+    {
+    }
+
+private:
+    Ref<CSSValue> m_value;
+};
+    
+} // namespace WebCore
+
+#define SPECIALIZE_TYPE_TRAITS_CSSOM_VALUE(ToValueTypeName, predicate) \
+SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
+static bool isType(const WebCore::DeprecatedCSSOMValue& value) { return value.predicate; } \
+SPECIALIZE_TYPE_TRAITS_END()
+
+SPECIALIZE_TYPE_TRAITS_CSSOM_VALUE(DeprecatedCSSOMComplexValue, isComplexValue())
+
+