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

mobile/android/moz.build

@@ -0,0 +1,36 @@
+# -*- 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/.
+
+CONFIGURE_SUBST_FILES += ['installer/Makefile']
+
+DIRS += [
+    '../locales',
+    'locales',
+]
+
+if CONFIG['MOZ_ANDROID_MLS_STUMBLER']:
+    DIRS += ['stumbler']
+
+DIRS += [
+    'javaaddons', # Must be built before base.
+    'base',
+    'chrome',
+    'components',
+    'extensions',
+    'modules',
+    'themes/core',
+    'app',
+    'fonts',
+]
+
+if CONFIG['MOZ_ANDROID_PACKAGE_INSTALL_BOUNCER']:
+    DIRS += ['bouncer'] # No ordering implied with respect to base.
+
+TEST_DIRS += [
+    'tests',
+]
+
+SPHINX_TREES['fennec'] = 'docs'