Initial implementation of AudioTrack, AudioTrackList, VideoTrack, and VideoTrackList.

Source/core/html/track/VideoTrackList.h

Index: Source/core/html/track/VideoTrackList.h
diff --git a/Source/core/html/track/VideoTrackList.h b/Source/core/html/track/VideoTrackList.h
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+++ b/Source/core/html/track/VideoTrackList.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef VideoTrackList_h
+#define VideoTrackList_h
+
+#include "bindings/v8/ScriptWrappable.h"
+#include "core/html/track/TrackListBase.h"
+#include "core/html/track/VideoTrack.h"
+
+namespace WebCore {
+
+class VideoTrackList FINAL : public TrackListBase<VideoTrack>, public ScriptWrappable {
+public:
+    static PassRefPtr<VideoTrackList> create(HTMLMediaElement&);
+
+    virtual ~VideoTrackList();
+
+    int selectedIndex() const { return m_selectedIndex; }
+
+    // EventTarget
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+
+    void trackSelected(const String& selectedTrackID);
+
+private:
+    explicit VideoTrackList(HTMLMediaElement&);
+    int m_selectedIndex;
+};
+
+}
+
+#endif