diff -r 000000000000 -r 6474c204b198 webapprt/test/chrome/head.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webapprt/test/chrome/head.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+/* 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/. */
+
+Cu.import("resource://gre/modules/Services.jsm");
+
+// Some of the code we want to provide to chrome mochitests is in another file
+// so we can share it with the mochitest shim window, thus we need to load it.
+Services.scriptloader
+        .loadSubScript("chrome://webapprt/content/mochitest-shared.js", this);
+
+const MANIFEST_URL_BASE = Services.io.newURI(
+  "http://test/webapprtChrome/webapprt/test/chrome/", null, null);
+
+/**
+ * Load the webapp in the app browser.
+ *
+ * @param {String} manifestURL
+ *        @see becomeWebapp
+ * @param {Object} parameters
+ *        @see becomeWebapp
+ * @param {Function} onLoad
+ *        The callback to call once the webapp is loaded.
+ */
+function loadWebapp(manifest, parameters, onLoad) {
+  let url = Services.io.newURI(manifest, null, MANIFEST_URL_BASE);
+
+  becomeWebapp(url.spec, parameters, function onBecome() {
+    function onLoadApp() {
+      gAppBrowser.removeEventListener("DOMContentLoaded", onLoadApp, true);
+      onLoad();
+    }
+    gAppBrowser.addEventListener("DOMContentLoaded", onLoadApp, true);
+    gAppBrowser.setAttribute("src", WebappRT.launchURI);
+  });
+
+  registerCleanupFunction(function() {
+    // We load DOMApplicationRegistry into a local scope to avoid appearing
+    // to leak it.
+    let scope = {};
+    Cu.import("resource://gre/modules/Webapps.jsm", scope);
+    scope.DOMApplicationRegistry.uninstall(url.spec);
+  });
+}