Add support to run emulator without ui on bots

build/android/avd.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.
 
 """Launches Android Virtual Devices with a set configuration for testing Chrome.
 
 The script will launch a specified number of Android Virtual Devices (AVD's).
 """
 
@@ skipping 40 matching lines @@
   run_parser.add_argument('--partition-size', dest='partition_size',
                           default=emulator.DEFAULT_STORAGE_SIZE,
                           help='Default internal storage size'
                           ' e.g. --partition-size=1024M')
   run_parser.add_argument('--launch-without-kill', action='store_false',
                           dest='kill_and_launch', default=True,
                           help='Kill all emulators at launch')
   run_parser.add_argument('--enable-kvm', action='store_true',
                           dest='enable_kvm', default=False,
                           help='Enable kvm for faster x86 emulator run')
+  run_parser.add_argument('--headless', action='store_true',
+                          dest='headless', default=False,
+                          help='Launch an emulator with no UI.')
 
   arguments = arg_parser.parse_args(argv[1:])
 
   logging.root.setLevel(logging.INFO)
 
   devil_chromium.Initialize()
 
   if arguments.command == 'kill':
     logging.info('Killing all existing emulator and existing the program')
     emulator.KillAllEmulators()
@@ skipping 42 matching lines @@
                      'Run install_emulator_deps.py.')
     return 1
 
   if arguments.name:
     emulator.LaunchEmulator(
         arguments.name,
         arguments.abi,
         enable_kvm=arguments.enable_kvm,
         kill_and_launch=arguments.reset_and_launch,
         sdcard_size=arguments.sdcard_size,
-        storage_size=arguments.partition_size
+        storage_size=arguments.partition_size,
+        headless=arguments.headless
     )
   else:
     emulator.LaunchTempEmulators(
         arguments.emulator_count,
         arguments.abi,
         arguments.api_level,
         enable_kvm=arguments.enable_kvm,
         kill_and_launch=arguments.kill_and_launch,
         sdcard_size=arguments.sdcard_size,
         storage_size=arguments.partition_size,
-        wait_for_boot=True
+        wait_for_boot=True,
+        headless=arguments.headless
     )
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))