Android gtest runner: Add --enable-concurrent-adb flag

build/android/test_runner.py

 #!/usr/bin/env python
 #
 # 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.
 
 """Runs all types of tests from one unified interface."""
 
 import argparse
 import collections
@@ skipping 172 matching lines @@
                      help=('Run the test under a tool '
                            '(use --tool help to list them)'))
   group.add_argument('-d', '--device', dest='test_device',
                      help=('Target device for the test suite '
                            'to run on.'))
   group.add_argument('--blacklist-file', help='Device blacklist file.')
   group.add_argument('--enable-device-cache', action='store_true',
                      help='Cache device state to disk between runs')
   group.add_argument('--incremental-install', action='store_true',
                      help='Use an _incremental apk.')
+  group.add_argument('--enable-concurrent-adb', action='store_true',
+                     help='Run multiple adb commands at the same time, even '
+                          'for the same device.')
 
 
 def AddGTestOptions(parser):
   """Adds gtest options to |parser|."""
 
   group = parser.add_argument_group('GTest Options')
   group.add_argument('-s', '--suite', dest='suite_name',
                      nargs='+', metavar='SUITE_NAME', required=True,
                      help='Executable name of the test suite to run.')
   group.add_argument('--gtest_also_run_disabled_tests',
@@ skipping 856 matching lines @@
     if e.is_infra_error:
       return constants.INFRA_EXIT_CODE
     return constants.ERROR_EXIT_CODE
   except: # pylint: disable=W0702
     logging.exception('Unrecognized error occurred.')
     return constants.ERROR_EXIT_CODE
 
 
 if __name__ == '__main__':
   sys.exit(main())