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diff --git a/Source/WebCore/css/parser/CSSParserObserverWrapper.h b/Source/WebCore/css/parser/CSSParserObserverWrapper.h
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+++ b/Source/WebCore/css/parser/CSSParserObserverWrapper.h
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+// Copyright 2015 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 "CSSParserObserver.h"
+
+namespace WebCore {
+
+class CSSParserObserverWrapper {
+public:
+    explicit CSSParserObserverWrapper(CSSParserObserver& observer)
+        : m_observer(observer)
+    { }
+
+    unsigned startOffset(const CSSParserTokenRange&);
+    unsigned previousTokenStartOffset(const CSSParserTokenRange&);
+    unsigned endOffset(const CSSParserTokenRange&); // Includes trailing comments
+
+    void skipCommentsBefore(const CSSParserTokenRange&, bool leaveDirectlyBefore);
+    void yieldCommentsBefore(const CSSParserTokenRange&);
+
+    CSSParserObserver& observer() { return m_observer; }
+    void addComment(unsigned startOffset, unsigned endOffset, unsigned tokensBefore)
+    {
+        CommentPosition position = {startOffset, endOffset, tokensBefore};
+        m_commentOffsets.append(position);
+    }
+    void addToken(unsigned startOffset) { m_tokenOffsets.append(startOffset); }
+    void finalizeConstruction(CSSParserToken* firstParserToken)
+    {
+        m_firstParserToken = firstParserToken;
+        m_commentIterator = m_commentOffsets.begin();
+    }
+
+private:
+    CSSParserObserver& m_observer;
+    Vector<unsigned> m_tokenOffsets;
+    CSSParserToken* m_firstParserToken;
+
+    struct CommentPosition {
+        unsigned startOffset;
+        unsigned endOffset;
+        unsigned tokensBefore;
+    };
+
+    Vector<CommentPosition> m_commentOffsets;
+    Vector<CommentPosition>::iterator m_commentIterator;
+};
+
+} // namespace WebCore