diff -r 000000000000 -r 6474c204b198 dom/audiochannel/AudioChannelCommon.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/audiochannel/AudioChannelCommon.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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 mozilla_dom_audiochannelcommon_h__
+#define mozilla_dom_audiochannelcommon_h__
+
+namespace mozilla {
+namespace dom {
+
+enum AudioChannelState {
+  AUDIO_CHANNEL_STATE_NORMAL = 0,
+  AUDIO_CHANNEL_STATE_MUTED,
+  AUDIO_CHANNEL_STATE_FADED,
+  AUDIO_CHANNEL_STATE_LAST
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif
+