pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/extensions/flyweb/content/aboutFlyWeb.js

@@ -0,0 +1,73 @@
+/* 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 {classes: Cc, interfaces: Ci, utils: Cu} = Components;
+
+Cu.import("resource://gre/modules/Console.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "Services", "resource://gre/modules/Services.jsm");
+
+XPCOMUtils.defineLazyGetter(this, "gFlyWebBundle", function() {
+  return Services.strings.createBundle("chrome://flyweb/locale/flyweb.properties");
+});
+
+let discoveryManager = new FlyWebDiscoveryManager();
+
+let discoveryCallback = {
+  onDiscoveredServicesChanged(services) {
+    if (!this.id) {
+      return;
+    }
+
+    let list = document.getElementById("flyweb-list");
+    while (list.firstChild) {
+      list.firstChild.remove();
+    }
+
+    let template = document.getElementById("flyweb-item-template");
+
+    for (let service of services) {
+      let item = template.cloneNode(true);
+      item.removeAttribute("id");
+
+      item.setAttribute("data-service-id", service.serviceId);
+      item.querySelector(".title").setAttribute("value", service.displayName);
+      item.querySelector(".icon").src = "chrome://flyweb/content/icon-64.png";
+
+      list.appendChild(item);
+    }
+  },
+  start() {
+    this.id = discoveryManager.startDiscovery(this);
+  },
+  stop() {
+    discoveryManager.stopDiscovery(this.id);
+    this.id = undefined;
+  }
+};
+
+window.addEventListener("DOMContentLoaded", () => {
+  let list = document.getElementById("flyweb-list");
+  list.addEventListener("click", (evt) => {
+    let serviceId = evt.target.closest("[data-service-id]").getAttribute("data-service-id");
+
+    discoveryManager.pairWithService(serviceId, {
+      pairingSucceeded(service) {
+        window.open(service.uiUrl, "FlyWebWindow_" + serviceId);
+      },
+
+      pairingFailed(error) {
+        console.error("FlyWeb failed to connect to service " + serviceId, error);
+      }
+    });
+  });
+
+  discoveryCallback.start();
+});
+
+window.addEventListener("unload", () => {
+  discoveryCallback.stop();
+});