diff -r 000000000000 -r 6474c204b198 dom/audiochannel/AudioChannelServiceChild.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/audiochannel/AudioChannelServiceChild.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- 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_audiochannelservicechild_h__
+#define mozilla_dom_audiochannelservicechild_h__
+
+#include "nsAutoPtr.h"
+#include "nsISupports.h"
+
+#include "AudioChannelService.h"
+#include "AudioChannelCommon.h"
+
+namespace mozilla {
+namespace dom {
+
+class AudioChannelServiceChild : public AudioChannelService
+{
+public:
+
+  /**
+   * Returns the AudioChannelServce singleton. Only to be called from main
+   * thread.
+   *
+   * @return NS_OK on proper assignment, NS_ERROR_FAILURE otherwise.
+   */
+  static AudioChannelService* GetAudioChannelService();
+
+  static void Shutdown();
+
+  virtual void RegisterAudioChannelAgent(AudioChannelAgent* aAgent,
+                                         AudioChannel aChannel,
+                                         bool aWithVideo);
+  virtual void UnregisterAudioChannelAgent(AudioChannelAgent* aAgent);
+
+  /**
+   * Return the state to indicate this agent should keep playing/
+   * fading volume/muted.
+   */
+  virtual AudioChannelState GetState(AudioChannelAgent* aAgent,
+                                     bool aElementHidden);
+
+  virtual void SetDefaultVolumeControlChannel(int32_t aChannel,
+                                              bool aHidden);
+
+protected:
+  AudioChannelServiceChild();
+  virtual ~AudioChannelServiceChild();
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif
+