Fix ADB path passing to GDB in devtools

mojo/devtools/common/debugger

 #!/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 codecs
 import logging
 import os.path
 import requests
@@ skipping 204 matching lines @@
         raise DirectoryNotFoundException()
     except DirectoryNotFoundException:
       logging.fatal("Unable to find the build directory, please specify it "
                     "using --build-dir.")
       return
 
   if args.package_name:
     debug_session_arguments["package_name"] = args.package_name
   else:
     debug_session_arguments["package_name"] = _DEFAULT_PACKAGE_NAME
+  if args.adb_path:
+    debug_session_arguments['adb'] = args.adb_path
   if args.pyelftools_dir:
     debug_session_arguments["pyelftools_dir"] = args.pyelftools_dir
   else:
     debug_session_arguments["pyelftools_dir"] = os.path.join(
         _get_dir_above('third_party'), 'third_party', 'pyelftools')
 
   debug_session_arguments_str = ', '.join(
       [k + '="' + codecs.encode(v, 'string_escape') + '"'
        for k, v in debug_session_arguments.items()])
 
@@ skipping 66 matching lines @@
   _add_device_command(subparsers)
   _add_tracing_command(subparsers)
   _add_wm_command(subparsers)
   _add_gdb_command(subparsers)
 
   args = parser.parse_args()
   return args.func(args)
 
 if __name__ == '__main__':
   sys.exit(main())