[Android] Support generic parallel execution across devices.

build/android/provision_devices.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.
 
 """Provisions Android devices with settings required for bots.
 
 Usage:
   ./provision_devices.py [-d <device serial number>]
 """
 
 import logging
 import optparse
 import os
 import re
 import subprocess
 import sys
 import time
 
 from pylib import android_commands
 from pylib import constants
 from pylib import device_settings
 from pylib.cmd_helper import GetCmdOutput
 from pylib.device import device_utils
 
+sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
+                             'third_party', 'android_testrunner'))
+import errors
+
 def KillHostHeartbeat():
   ps = subprocess.Popen(['ps', 'aux'], stdout = subprocess.PIPE)
   stdout, _ = ps.communicate()
   matches = re.findall('\\n.*host_heartbeat.*', stdout)
   for match in matches:
     print 'An instance of host heart beart running... will kill'
     pid = re.findall('(\d+)', match)[1]
     subprocess.call(['kill', str(pid)])
 
 
@@ skipping 128 matching lines @@
 
   if args:
     print >> sys.stderr, 'Unused args %s' % args
     return 1
 
   if options.wipe:
     devices = android_commands.GetAttachedDevices()
     for device_serial in devices:
       device = device_utils.DeviceUtils(device_serial)
       WipeDeviceData(device)
-    device_utils.RebootDevices()
+    try:
+      (device_utils.DeviceUtils.parallel(devices)
+          .old_interface.Reboot(True).pFinish(None))
+    except errors.DeviceUnresponsiveError:
+      pass
   else:
     ProvisionDevices(options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))