diff -r 000000000000 -r 6474c204b198 dom/webidl/ActivityRequestHandler.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/ActivityRequestHandler.webidl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+/* 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/. */
+
+[Pref="dom.sysmsg.enabled",
+ JSImplementation="@mozilla.org/dom/activities/request-handler;1",
+ ChromeConstructor(DOMString id, optional ActivityOptions options),
+ ChromeOnly]
+interface ActivityRequestHandler
+{
+    void postResult(any result);
+    void postError(DOMString error);
+    [Pure, Cached, Frozen]
+    readonly attribute ActivityOptions source;
+};