Have mojo_shell run in its custom thread on android.

mojo/mojo.gyp

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'target_defaults': {
     'conditions': [
       ['mojo_shell_debug_url != ""', {
         'defines': [
           'MOJO_SHELL_DEBUG=1',
@@ skipping 567 matching lines @@
         'shell/out_of_process_dynamic_service_runner.cc',
         'shell/out_of_process_dynamic_service_runner.h',
         'shell/run.cc',
         'shell/run.h',
         'shell/switches.cc',
         'shell/switches.h',
         'shell/task_runners.cc',
         'shell/task_runners.h',
         'shell/test_child_process.cc',
         'shell/test_child_process.h',
+        'shell/ui_service_loader_android.cc',
+        'shell/ui_service_loader_android.h',
         'shell/view_manager_loader.cc',
         'shell/view_manager_loader.h',
       ],
       'conditions': [
         ['OS=="linux"', {
           'dependencies': [
             '../build/linux/system.gyp:dbus',
             '../dbus/dbus.gyp:dbus',
           ],
         }],
@@ skipping 452 matching lines @@
             'views/views_init_internal.h',
           ],
           'defines': [
             'MOJO_VIEWS_IMPLEMENTATION',
           ],
         },
       ],
     }],
   ],
 }