add option to suport setting target device for test

build/android/run_tests.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.
 
 """Runs all the native unit tests.
 
 1. Copy over test binary to /data/local on device.
 2. Resources: chrome/unit_tests requires resources (chrome.pak and en-US.pak)
    to be deployed to the device (in /data/local/tmp).
@@ skipping 303 matching lines @@
     for n in range(options.use_emulator):
       t = TimeProfile('Emulator launch %d' % n)
       buildbot_emulator = emulator.Emulator(options.fast_and_loose)
       buildbot_emulator.Launch(kill_all_emulators=n == 0)
       t.Stop()
       buildbot_emulators.append(buildbot_emulator)
       attached_devices.append(buildbot_emulator.device)
     # Wait for all emulators to become available.
     map(lambda buildbot_emulator:buildbot_emulator.ConfirmLaunch(),
         buildbot_emulators)
+  elif options.test_device:
+    attached_devices = [options.test_device]
   else:
     attached_devices = android_commands.GetAttachedDevices()
 
   if not attached_devices:
     logging.critical('A device must be attached and online.')
     return 1
 
   if (len(attached_devices) > 1 and options.test_suite and
       not options.gtest_filter and not options.performance_test):
     sharder = TestSharder(attached_devices, options.test_suite,
@@ skipping 69 matching lines @@
   for test_suite in _TEST_SUITES:
     print test_suite
 
 
 def main(argv):
   option_parser = run_tests_helper.CreateTestRunnerOptionParser(None,
       default_timeout=0)
   option_parser.add_option('-s', '--suite', dest='test_suite',
                            help='Executable name of the test suite to run '
                            '(use -s help to list them)')
+  option_parser.add_option('-d', '--device', dest='test_device',
+                           help='Target device the test suite to run ')
   option_parser.add_option('-r', dest='rebaseline',
                            help='Rebaseline and update *testsuite_disabled',
                            action='store_true',
                            default=False)
   option_parser.add_option('-f', '--gtest_filter', dest='gtest_filter',
                            help='gtest filter')
   option_parser.add_option('-a', '--test_arguments', dest='test_arguments',
                            help='Additional arguments to pass to the test')
   option_parser.add_option('-p', dest='performance_test',
                            help='Indicator of performance test',
@@ skipping 43 matching lines @@
   # from all suites, but the buildbot associates the exit status only with the
   # most recent step).
   if options.annotate:
     return 0
   else:
     return failed_tests_count
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))