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diff --git a/Source/WebCore/css/MediaQueryExpression.h b/Source/WebCore/css/MediaQueryExpression.h
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+++ b/Source/WebCore/css/MediaQueryExpression.h
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+/*
+ * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+ * 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 THE AUTHOR ``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 "CSSParserToken.h"
+#include "CSSValue.h"
+#include <memory>
+
+namespace WebCore {
+
+class MediaQueryExpression {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit MediaQueryExpression(const String& mediaFeature, const Vector<CSSParserToken, 4>& tokenList);
+
+    const AtomicString& mediaFeature() const;
+    CSSValue* value() const;
+
+    bool isValid() const;
+
+    String serialize() const;
+
+    bool operator==(const MediaQueryExpression&) const;
+
+private:
+    AtomicString m_mediaFeature;
+    RefPtr<CSSValue> m_value;
+    bool m_isValid { false };
+    mutable String m_serializationCache;
+};
+
+inline const AtomicString& MediaQueryExpression::mediaFeature() const
+{
+    return m_mediaFeature;
+}
+
+inline CSSValue* MediaQueryExpression::value() const
+{
+    return m_value.get();
+}
+
+inline bool MediaQueryExpression::operator==(const MediaQueryExpression& other) const
+{
+    return other.m_mediaFeature == m_mediaFeature
+        && ((!m_value && !other.m_value) || (m_value && other.m_value && *m_value == *other.m_value));
+}
+
+inline bool MediaQueryExpression::isValid() const
+{
+    return m_isValid;
+}
+
+} // namespace