S3 devices should not be rebooted in provision step.

build/android/buildbot/bb_device_steps.py

 #!/usr/bin/env python
 # Copyright (c) 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.
 
 import collections
 import glob
 import hashlib
 import json
 import multiprocessing
@@ skipping 384 matching lines @@
 
 def ProvisionDevices(options):
   bb_annotations.PrintNamedStep('provision_devices')
 
   if not bb_utils.TESTING:
     # Restart adb to work around bugs, sleep to wait for usb discovery.
     adb = android_commands.AndroidCommands()
     adb.RestartAdbServer()
     RunCmd(['sleep', '1'])
 
-  if options.reboot:
+  if not options.no_reboot:
     RebootDevices()
   provision_cmd = ['build/android/provision_devices.py', '-t', options.target]
   if options.auto_reconnect:
     provision_cmd.append('--auto-reconnect')
   RunCmd(provision_cmd)
 
 
 def DeviceStatusCheck(options):
   bb_annotations.PrintNamedStep('device_status_check')
   cmd = ['build/android/buildbot/bb_device_status_check.py']
@@ skipping 154 matching lines @@
                     help='Run experiemental tests')
   parser.add_option('-f', '--test-filter', metavar='<filter>', default=[],
                     action='append',
                     help=('Run a test suite. Test suites: "%s"' %
                           '", "'.join(VALID_TESTS)))
   parser.add_option('--gtest-filter',
                     help='Filter for running a subset of tests of a gtest test')
   parser.add_option('--asan', action='store_true', help='Run tests with asan.')
   parser.add_option('--install', metavar='<apk name>',
                     help='Install an apk by name')
-  parser.add_option('--reboot', action='store_true',
-                    help='Reboot devices before running tests')
+  parser.add_option('--no-reboot', action='store_true',
+                    help='Do not reboot devices during provisioning.')
   parser.add_option('--coverage-bucket',
                     help=('Bucket name to store coverage results. Coverage is '
                           'only run if this is set.'))
   parser.add_option('--restart-usb', action='store_true',
                     help='Restart usb ports before device status check.')
   parser.add_option(
       '--flakiness-server',
       help=('The flakiness dashboard server to which the results should be '
             'uploaded.'))
   parser.add_option(
@@ skipping 20 matching lines @@
   setattr(options, 'target', options.factory_properties.get('target', 'Debug'))
   if options.coverage_bucket:
     setattr(options, 'coverage_dir',
             os.path.join(CHROME_OUT_DIR, options.target, 'coverage'))
 
   MainTestWrapper(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))