Support running with mojo:debugger in devtools.

mojo/tools/android_mojo_shell.py

 #!/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 logging
 import sys
 
 import devtools
@@ skipping 31 matching lines @@
   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('--target-cpu', help='CPU architecture to run for.',
                       choices=['x64', 'x86', 'arm'])
   parser.add_argument('--origin', help='Origin for mojo: URLs.')
   parser.add_argument('--target-device', help='Device to run on.')
   parser.add_argument('--logcat-tags', help='Comma-separated list of '
                       'additional logcat tags to display on the console.')
+  parser.add_argument('--debugger', action="store_true",
+                      help='Run with mojo:debugger.')
   parser.add_argument('-v', '--verbose', action="store_true",
                       help="Increase output verbosity")
   launcher_args, args = parser.parse_known_args()
 
   config = Config(target_os=Config.OS_ANDROID,
                   target_cpu=launcher_args.target_cpu,
                   is_debug=launcher_args.debug)
   paths = Paths(config)
   verbose_pipe = sys.stdout if launcher_args.verbose else None
   shell = AndroidShell(paths.adb_path, launcher_args.target_device,
                        logcat_tags=launcher_args.logcat_tags,
                        verbose_pipe=verbose_pipe)
   shell.InstallApk(paths.target_mojo_shell_path)
   args.append("--origin=" + launcher_args.origin if launcher_args.origin else
               shell.SetUpLocalOrigin(paths.build_dir))
   args = shell_arguments.RewriteMapOriginParameters(shell, args)
+  if launcher_args.debugger:
+    args.extend(shell_arguments.ConfigureDebugger(shell))
   shell.Run(args)
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(main())