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diff --git a/Source/WebCore/css/parser/CSSParserTokenRange.h b/Source/WebCore/css/parser/CSSParserTokenRange.h
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+++ b/Source/WebCore/css/parser/CSSParserTokenRange.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 <wtf/Vector.h>
+
+namespace WebCore {
+
+// A CSSParserTokenRange is an iterator over a subrange of a vector of CSSParserTokens.
+// Accessing outside of the range will return an endless stream of EOF tokens.
+// This class refers to half-open intervals [first, last).
+class CSSParserTokenRange {
+public:
+    template<size_t inlineBuffer>
+    CSSParserTokenRange(const Vector<CSSParserToken, inlineBuffer>& vector)
+        : m_first(vector.begin())
+        , m_last(vector.end())
+    {
+    }
+
+    // This should be called on a range with tokens returned by that range.
+    CSSParserTokenRange makeSubRange(const CSSParserToken* first, const CSSParserToken* last) const;
+
+    bool atEnd() const { return m_first == m_last; }
+    const CSSParserToken* end() const { return m_last; }
+
+    const CSSParserToken& peek(unsigned offset = 0) const
+    {
+        if (m_first + offset >= m_last)
+            return eofToken();
+        return *(m_first + offset);
+    }
+
+    const CSSParserToken& consume()
+    {
+        if (m_first == m_last)
+            return eofToken();
+        return *m_first++;
+    }
+
+    const CSSParserToken& consumeIncludingWhitespace()
+    {
+        const CSSParserToken& result = consume();
+        consumeWhitespace();
+        return result;
+    }
+
+    // The returned range doesn't include the brackets
+    CSSParserTokenRange consumeBlock();
+    CSSParserTokenRange consumeBlockCheckingForEditability(StyleSheetContents*);
+
+    void consumeComponentValue();
+
+    void consumeWhitespace()
+    {
+        while (peek().type() == WhitespaceToken)
+            ++m_first;
+    }
+
+    String serialize() const;
+
+    const CSSParserToken* begin() const { return m_first; }
+
+    static CSSParserToken& eofToken();
+
+private:
+    CSSParserTokenRange(const CSSParserToken* first, const CSSParserToken* last)
+        : m_first(first)
+        , m_last(last)
+    { }
+
+    const CSSParserToken* m_first;
+    const CSSParserToken* m_last;
+};
+
+} // namespace WebCore