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

mobile/android/components/build/moz.build

@@ -0,0 +1,31 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+XPIDL_SOURCES += [
+    'nsIShellService.idl',
+]
+
+XPIDL_MODULE = 'browsercomps'
+
+EXPORTS += [
+    'nsBrowserComponents.h',
+]
+
+SOURCES += [
+    'nsBrowserModule.cpp',
+    'nsShellService.cpp',
+]
+
+if CONFIG['MOZ_ANDROID_HISTORY']:
+    SOURCES += [
+        'nsAndroidHistory.cpp',
+    ]
+    LOCAL_INCLUDES += [
+        '/docshell/base',
+        '/dom/base',
+    ]
+
+FINAL_LIBRARY = 'xul'