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diff --git a/Source/WebCore/html/track/TextTrack.h b/Source/WebCore/html/track/TextTrack.h
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+++ b/Source/WebCore/html/track/TextTrack.h
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+/*
+ * Copyright (C) 2011 Google 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 APPLE COMPUTER, INC. ``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 COMPUTER, 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.
+ */
+
+#ifndef TextTrack_h
+#define TextTrack_h
+
+#if ENABLE(VIDEO_TRACK)
+
+#include "ExceptionCode.h"
+#include "TrackBase.h"
+#include <wtf/PassOwnPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class HTMLMediaElement;
+class TextTrack;
+class TextTrackCue;
+class TextTrackCueList;
+
+class TextTrackClient {
+public:
+    virtual ~TextTrackClient() { }
+    virtual void textTrackKindChanged(TextTrack*) = 0;
+    virtual void textTrackModeChanged(TextTrack*) = 0;
+    virtual void textTrackAddCues(TextTrack*, const TextTrackCueList*) = 0;
+    virtual void textTrackRemoveCues(TextTrack*, const TextTrackCueList*) = 0;
+    virtual void textTrackAddCue(TextTrack*, PassRefPtr<TextTrackCue>) = 0;
+    virtual void textTrackRemoveCue(TextTrack*, PassRefPtr<TextTrackCue>) = 0;
+};
+
+class TextTrack : public TrackBase {
+public:
+    static PassRefPtr<TextTrack> create(ScriptExecutionContext* context, TextTrackClient* client, const String& kind, const String& label, const String& language)
+    {
+        return adoptRef(new TextTrack(context, client, kind, label, language, AddTrack));
+    }
+    virtual ~TextTrack();
+
+    void setMediaElement(HTMLMediaElement* element) { m_mediaElement = element; }
+    HTMLMediaElement* mediaElement() { return m_mediaElement; }
+
+    String kind() const { return m_kind; }
+    void setKind(const String&);
+
+    static const AtomicString& subtitlesKeyword();
+    static const AtomicString& captionsKeyword();
+    static const AtomicString& descriptionsKeyword();
+    static const AtomicString& chaptersKeyword();
+    static const AtomicString& metadataKeyword();
+    static bool isValidKindKeyword(const String&);
+
+    String label() const { return m_label; }
+    void setLabel(const String& label) { m_label = label; }
+
+    String language() const { return m_language; }
+    void setLanguage(const String& language) { m_language = language; }
+
+    enum Mode { DISABLED = 0, HIDDEN = 1, SHOWING = 2 };
+    Mode mode() const;
+    void setMode(unsigned short, ExceptionCode&);
+
+    bool showingByDefault() const { return m_showingByDefault; }
+    void setShowingByDefault(bool showing) { m_showingByDefault = showing; }
+
+    enum ReadinessState { NotLoaded = 0, Loading = 1, Loaded = 2, FailedToLoad = 3 };
+    ReadinessState readinessState() const { return m_readinessState; }
+    void setReadinessState(ReadinessState state) { m_readinessState = state; }
+
+    TextTrackCueList* cues();
+    TextTrackCueList* activeCues() const;
+
+    virtual void clearClient() { m_client = 0; }
+    TextTrackClient* client() { return m_client; }
+
+    void addCue(PassRefPtr<TextTrackCue>, ExceptionCode&);
+    void removeCue(TextTrackCue*, ExceptionCode&);
+
+    virtual void fireCueChangeEvent() { };
+
+    void cueWillChange(TextTrackCue*);
+    void cueDidChange(TextTrackCue*);
+
+    DEFINE_ATTRIBUTE_EVENT_LISTENER(cuechange);
+
+    enum TextTrackType { TrackElement, AddTrack, InBand };
+    TextTrackType trackType() const { return m_trackType; }
+
+    int trackIndex();
+    void invalidateTrackIndex();
+
+protected:
+    TextTrack(ScriptExecutionContext*, TextTrackClient*, const String& kind, const String& label, const String& language, TextTrackType);
+
+    RefPtr<TextTrackCueList> m_cues;
+
+private:
+    TextTrackCueList* ensureTextTrackCueList();
+    HTMLMediaElement* m_mediaElement;
+    String m_kind;
+    String m_label;
+    String m_language;
+    Mode m_mode;
+    TextTrackClient* m_client;
+    TextTrackType m_trackType;
+    ReadinessState m_readinessState;
+    bool m_showingByDefault;
+    int m_trackIndex;
+};
+
+} // namespace WebCore
+
+#endif
+#endif