Media Source dispatches inband text tracks

media/base/text_track.h

Index: media/base/text_track.h
diff --git a/media/base/text_track.h b/media/base/text_track.h
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+// Copyright (c) 2012 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 MEDIA_BASE_TEXT_TRACK_H_
+#define MEDIA_BASE_TEXT_TRACK_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time.h"
+
+namespace media {
+
+// Specifies the varieties of text tracks.
+enum TextKind {
+  kTextSubtitles,
+  kTextCaptions,
+  kTextDescriptions,
+  kTextMetadata,
+  kTextNone
+};
+
+class TextTrack {
+ public:
+  virtual ~TextTrack() {}
+  virtual void addWebVTTCue(const base::TimeDelta& start,
+                            const base::TimeDelta& end,
+                            const std::string& id,
+                            const std::string& content,
+                            const std::string& settings) = 0;
+};
+
+typedef base::Callback<scoped_ptr<TextTrack>
+    (TextKind kind,
+     const std::string& label,
+     const std::string& language)> AddTextTrackCB;
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_TEXT_TRACK_H_