new_contents: #!/usr/bin/env python
  # Copyright 2014 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.
  
  import argparse
  import atexit
  import logging
  import threading
  import os
  import sys
  
  import SimpleHTTPServer
  import SocketServer
  
  from mopy.config import Config
  from mopy.paths import Paths
  
  sys.path.insert(0, os.path.join(Paths().src_root, 'build', 'android'))
  from pylib import android_commands
  from pylib import constants
  from pylib import forwarder
  
  TAGS = [
      'AndroidHandler',
      'MojoMain',
      'MojoShellActivity',
      'MojoShellApplication',
      'chromium',
  ]
  
  USAGE = ("android_mojo_shell.py "
           "[--args-for=<mojo-app>] "
           "[--content-handlers=<handlers>] "
           "[--enable-external-applications] "
           "[--disable-cache] "
           "[--enable-multiprocess] "
           "[--url-mappings=from1=to1,from2=to2] "
           "[<mojo-app> | --no-url] "
           """
  
  A <mojo-app> is a Mojo URL or a Mojo URL and arguments within quotes.
  Example: mojo_shell "mojo:js_standalone test.js".
  <url-lib-path> is searched for shared libraries named by mojo URLs.
  The value of <handlers> is a comma separated list like:
  text/html,mojo:html_viewer,application/javascript,mojo:js_content_handler
  """)
  
  def GetHandlerForPath(base_path):
    class RequestHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
      """
      Handler for SocketServer.TCPServer that will serve the files from
      |base_path| directory over http.
      """
  
      def translate_path(self, path):
        path_from_current = (
            SimpleHTTPServer.SimpleHTTPRequestHandler.translate_path(self, path))
        return os.path.join(base_path, os.path.relpath(path_from_current))
  
    return RequestHandler
  
  def main():
    logging.basicConfig()
  
    parser = argparse.ArgumentParser(usage=USAGE)
  
    debug_group = parser.add_mutually_exclusive_group()
    debug_group.add_argument('--debug', help='Debug build (default)',
                             default=True, action='store_true')
    debug_group.add_argument('--release', help='Release build', default=False,
                             dest='debug', action='store_false')
    parser.add_argument('--no-url',
                        help='Allows not to provide a application URL',
                        action='store_true')
    launcher_args, args = parser.parse_known_args()
  
    paths = Paths(Config(target_os=Config.OS_ANDROID,
                         is_debug=launcher_args.debug))
    constants.SetOutputDirectort(paths.build_dir)
  
    httpd = SocketServer.TCPServer(('127.0.0.1', 0),
                                   GetHandlerForPath(paths.build_dir))
    atexit.register(httpd.shutdown)
    port = httpd.server_address[1]
  
    http_thread = threading.Thread(target=httpd.serve_forever)
    http_thread.daemon = True
    http_thread.start()
  
    device = android_commands.AndroidCommands(
        android_commands.GetAttachedDevices()[0])
    device.EnableAdbRoot()
  
    atexit.register(forwarder.Forwarder.UnmapAllDevicePorts, device)
    forwarder.Forwarder.Map([(0, port)], device)
    device_port = forwarder.Forwarder.DevicePortForHostPort(port)
  
    cmd = ('am start'
           ' -W'
           ' -S'
           ' -a android.intent.action.VIEW'
           ' -n org.chromium.mojo_shell_apk/.MojoShellActivity')
  
    parameters = [
        '--origin=http://127.0.0.1:%d/' % device_port
    ]
  
    url = None
    if launcher_args.no_url:
      parameters += args
    else:
      url = args[-1]
      parameters += args[:-1]
  
    cmd += ' --esa parameters \"%s\"' % ','.join(parameters)
  
    if url:
      cmd += ' -d %s' % url
  
    device.RunShellCommand('logcat -c')
    device.RunShellCommand(cmd)
    os.system("%s logcat -s %s" % (constants.GetAdbPath(), ' '.join(TAGS)))
    device.RunShellCommand("am force-stop org.chromium.mojo_shell_apk")
    return 0
  
  if __name__ == "__main__":
    sys.exit(main())
  
subject: Add a launcher script for the mojo shell on android.