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diff --git a/Source/WebCore/css/parser/SizesCalcParser.h b/Source/WebCore/css/parser/SizesCalcParser.h
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+// Copyright 2014 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 "CSSParserToken.h"
+#include "CSSParserTokenRange.h"
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class Document;
+
+struct SizesCalcValue {
+    double value;
+    bool isLength;
+    UChar operation;
+
+    SizesCalcValue()
+        : value(0)
+        , isLength(false)
+        , operation(0)
+    {
+    }
+
+    SizesCalcValue(double numericValue, bool length)
+        : value(numericValue)
+        , isLength(length)
+        , operation(0)
+    {
+    }
+};
+
+class SizesCalcParser {
+public:
+    SizesCalcParser(CSSParserTokenRange, const Document&);
+
+    float result() const;
+    bool isValid() const { return m_isValid; }
+
+private:
+    bool calcToReversePolishNotation(CSSParserTokenRange);
+    bool calculate();
+    void appendNumber(const CSSParserToken&);
+    bool appendLength(const CSSParserToken&);
+    bool handleOperator(Vector<CSSParserToken>& stack, const CSSParserToken&);
+    void appendOperator(const CSSParserToken&);
+
+    Vector<SizesCalcValue> m_valueList;
+    bool m_isValid;
+    float m_result;
+    const Document& m_document;
+};
+
+} // namespace WebCore