diff -r 000000000000 -r 6474c204b198 dom/power/nsIDOMWakeLockListener.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/power/nsIDOMWakeLockListener.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 40; 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/. */
+
+#include "nsISupports.idl"
+
+[scriptable, function, uuid(4e258af8-cffb-47bc-b16d-e8241243426e)]
+interface nsIDOMMozWakeLockListener : nsISupports
+{
+  /**
+   * The callback will be called when a lock topic changes its lock
+   * state.
+   *
+   * Possible states are:
+   *
+   *  - "unlocked" - nobody holds the wake lock.
+   *
+   *  - "locked-foreground" - at least one window holds the wake lock,
+   *    and it is visible.
+   *
+   *  - "locked-background" - at least one window holds the wake lock,
+   *    but all of them are hidden.
+   *
+   * @param aTopic The resource name related to the wake lock.
+   * @param aState The wake lock state
+   */
+  void callback(in DOMString aTopic, in DOMString aState);
+};