diff -r 000000000000 -r 6474c204b198 dom/webidl/MozInterAppMessageEvent.webidl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/webidl/MozInterAppMessageEvent.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/. */
+
+dictionary MozInterAppMessageEventInit : EventInit {
+  any data = null;
+};
+
+[HeaderFile="mozilla/dom/InterAppComm.h",
+ Func="mozilla::dom::InterAppComm::EnabledForScope",
+ Constructor(DOMString type,
+             optional MozInterAppMessageEventInit eventInitDict)]
+interface MozInterAppMessageEvent : Event {
+  readonly attribute any data;
+};