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

mobile/android/chrome/content/geckoview.xul

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<!-- 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/. -->
+
+<?xml-stylesheet href="chrome://browser/content/browser.css" type="text/css"?>
+
+<window id="main-window"
+        onload="startup();"
+        windowtype="navigator:browser"
+        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <browser id="content" type="content-primary" src="https://mozilla.com" flex="1" remote="true"/>
+
+  <script type="application/javascript" src="chrome://browser/content/geckoview.js"/>
+</window>