[Android] Support generic parallel execution across devices.

build/android/adb_install_apk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012 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.
 
 """Utility script to install APKs from the command line quickly."""
 
-import multiprocessing
 import optparse
 import os
 import sys
 
 from pylib import android_commands
 from pylib import constants
 from pylib.device import device_utils
 from pylib.utils import apk_helper
 
 
@@ skipping 23 matching lines @@
 
 def ValidateInstallAPKOption(option_parser, options):
   """Validates the apk option and potentially qualifies the path."""
   if not options.apk:
     option_parser.error('--apk is mandatory.')
   if not os.path.exists(options.apk):
     options.apk = os.path.join(constants.GetOutDirectory(), 'apks',
                                options.apk)
 
 
-def _InstallApk(args):
-  apk_path, apk_package, keep_data, device = args
-  device_utils.DeviceUtils(device=device).old_interface.ManagedInstall(
-      apk_path, keep_data, apk_package)
-  print '-----  Installed on %s  -----' % device
-
-
 def main(argv):
   parser = optparse.OptionParser()
   AddInstallAPKOption(parser)
   options, args = parser.parse_args(argv)
   constants.SetBuildType(options.build_type)
   ValidateInstallAPKOption(parser, options)
   if len(args) > 1:
     raise Exception('Error: Unknown argument:', args[1:])
 
   devices = android_commands.GetAttachedDevices()
   if not devices:
     raise Exception('Error: no connected devices')
 
   if not options.apk_package:
     options.apk_package = apk_helper.GetPackageName(options.apk)
 
-  pool = multiprocessing.Pool(len(devices))
-  # Send a tuple (apk_path, apk_package, device) per device.
-  pool.map(_InstallApk, zip([options.apk] * len(devices),
-                            [options.apk_package] * len(devices),
-                            [options.keep_data] * len(devices),
-                            devices))
+  device_utils.DeviceUtils.parallel(devices).old_interface.ManagedInstall(
+      options.apk, options.keep_data, options.apk_package).pFinish(None)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))
+