diff -r 000000000000 -r 6474c204b198 dom/activities/src/ActivityRequestHandler.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/activities/src/ActivityRequestHandler.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+/* 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/. */
+
+"use strict";
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
+                                   "@mozilla.org/childprocessmessagemanager;1",
+                                   "nsISyncMessageSender");
+
+function debug(aMsg) {
+  //dump("-- ActivityRequestHandler.js " + Date.now() + " : " + aMsg + "\n");
+}
+
+/**
+  * nsIDOMMozActivityRequestHandler implementation.
+  */
+
+function ActivityRequestHandler() {
+  debug("ActivityRequestHandler");
+
+  // When a system message of type 'activity' is emitted, it forces the
+  // creation of an ActivityWrapper which in turns replace the default
+  // system message callback. The newly created wrapper then create an
+  // ActivityRequestHandler object.
+}
+
+ActivityRequestHandler.prototype = {
+  init: function arh_init(aWindow) {
+    this._window = aWindow;
+  },
+
+  __init: function arh___init(aId, aOptions) {
+    this._id = aId;
+    this._options = aOptions;
+  },
+
+  get source() {
+    // We need to clone this object because the this._options.data has
+    // the type any in WebIDL which will cause the binding layer to pass
+    // the value which is a COW unmodified to content.
+    return Cu.cloneInto(this._options, this._window);
+  },
+
+  postResult: function arh_postResult(aResult) {
+    cpmm.sendAsyncMessage("Activity:PostResult", {
+      "id": this._id,
+      "result": aResult
+    });
+    Services.obs.notifyObservers(null, "activity-success", this._id);
+  },
+
+  postError: function arh_postError(aError) {
+    cpmm.sendAsyncMessage("Activity:PostError", {
+      "id": this._id,
+      "error": aError
+    });
+    Services.obs.notifyObservers(null, "activity-error", this._id);
+  },
+
+  classID: Components.ID("{9326952a-dbe3-4d81-a51f-d9c160d96d6b}"),
+
+  QueryInterface: XPCOMUtils.generateQI([
+    Ci.nsIDOMGlobalPropertyInitializer
+  ])
+}
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ActivityRequestHandler]);