diff -r 000000000000 -r 6474c204b198 dom/activities/interfaces/nsIActivityProxy.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/activities/interfaces/nsIActivityProxy.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* 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"
+
+interface nsIDOMWindow;
+
+/**
+  * Implemented by @mozilla.org/dom/activities/proxy;1
+  */
+[scriptable, uuid(60adef0f-c1a7-4dc5-bc0d-4b879f1e59ca)]
+interface nsIActivityProxy : nsISupports
+{
+    void startActivity(in nsISupports /* MozActivity */ activity,
+                       in jsval options,
+                       in nsIDOMWindow window);
+    void cleanup();
+};