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diff --git a/WebCore/css/MediaQueryList.h b/WebCore/css/MediaQueryList.h
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+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ */
+
+#ifndef MediaQueryList_h
+#define MediaQueryList_h
+
+#include <wtf/Forward.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class MediaList;
+class MediaQueryListListener;
+class MediaQueryEvaluator;
+class MediaQueryMatcher;
+
+// MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
+// The objects of this class are returned by window.matchMedia. They may be used to
+// retrieve the current value of the given media query and to add/remove listeners that
+// will be called whenever the value of the query changes.
+
+class MediaQueryList : public RefCounted<MediaQueryList> {
+public:
+    static PassRefPtr<MediaQueryList> create(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool);
+    ~MediaQueryList();
+
+    String media() const;
+    bool matches();
+
+    void addListener(PassRefPtr<MediaQueryListListener>);
+    void removeListener(PassRefPtr<MediaQueryListListener>);
+
+    void evaluate(MediaQueryEvaluator*, bool& notificationNeeded);
+
+private:
+    MediaQueryList(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool matches);
+    void setMatches(bool);
+
+    RefPtr<MediaQueryMatcher> m_matcher;
+    RefPtr<MediaList> m_media;
+    unsigned m_evaluationRound; // Indicates if the query has been evaluated after the last style selector change.
+    unsigned m_changeRound; // Used to know if the query has changed in the last style selector change.
+    bool m_matches;
+};
+
+}
+
+#endif // MediaQueryList_h