Android gtest runner: Add --enable-concurrent-adb flag

build/android/pylib/local/device/local_device_environment.py

 # Copyright 2014 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 logging
 import os
 import threading
 
 from devil.android import device_blacklist
 from devil.android import device_errors
@@ skipping 15 matching lines @@
     self._blacklist = (device_blacklist.Blacklist(args.blacklist_file)
                        if args.blacklist_file
                        else None)
     self._device_serial = args.test_device
     self._devices_lock = threading.Lock()
     self._devices = []
     self._max_tries = 1 + args.num_retries
     self._tool_name = args.tool
     self._enable_device_cache = args.enable_device_cache
     self._incremental_install = args.incremental_install
+    self._concurrent_adb = args.enable_concurrent_adb
 
   #override
   def SetUp(self):
     available_devices = device_utils.DeviceUtils.HealthyDevices(
         self._blacklist, enable_device_files_cache=self._enable_device_cache)
     if not available_devices:
       raise device_errors.NoDevicesError
     if self._device_serial:
       self._devices = [d for d in available_devices
                        if d.adb.GetDeviceSerial() == self._device_serial]
@@ skipping 12 matching lines @@
             d.LoadCacheData(f.read())
           os.unlink(cache_path)
 
   @property
   def devices(self):
     if not self._devices:
       raise device_errors.NoDevicesError()
     return self._devices
 
   @property
+  def concurrent_adb(self):
+    return self._concurrent_adb
+
+  @property
   def incremental_install(self):
     return self._incremental_install
 
   @property
   def parallel_devices(self):
     return parallelizer.SyncParallelizer(self.devices)
 
   @property
   def max_tries(self):
     return self._max_tries
@@ skipping 18 matching lines @@
       logging.warning(
           'Attempted to blacklist %s, but no blacklist was provided.',
           str(device))
       return
 
     device_serial = device.adb.GetDeviceSerial()
     self._blacklist.Extend([device_serial])
     with self._devices_lock:
       self._devices = [d for d in self._devices if str(d) != device_serial]