diff -r 000000000000 -r 6474c204b198 content/media/AudioStreamTrack.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/AudioStreamTrack.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef AUDIOSTREAMTRACK_H_
+#define AUDIOSTREAMTRACK_H_
+
+#include "MediaStreamTrack.h"
+#include "DOMMediaStream.h"
+
+namespace mozilla {
+namespace dom {
+
+class AudioStreamTrack : public MediaStreamTrack {
+public:
+  AudioStreamTrack(DOMMediaStream* aStream, TrackID aTrackID)
+    : MediaStreamTrack(aStream, aTrackID) {}
+
+  virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
+
+  virtual AudioStreamTrack* AsAudioStreamTrack() { return this; }
+
+  // WebIDL
+  virtual void GetKind(nsAString& aKind) { aKind.AssignLiteral("audio"); }
+};
+
+}
+}
+
+#endif /* AUDIOSTREAMTRACK_H_ */