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

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

Index: build/android/pylib/local/device/local_device_environment.py
diff --git a/build/android/pylib/local/device/local_device_environment.py b/build/android/pylib/local/device/local_device_environment.py
index b877dbc91d2db145e36e6ec9055a9731e0915d4a..4fdfbdff9b8e4cb8649db6406b74cfa7bfd600f7 100644
--- a/build/android/pylib/local/device/local_device_environment.py
+++ b/build/android/pylib/local/device/local_device_environment.py
@@ -33,6 +33,7 @@ class LocalDeviceEnvironment(environment.Environment):
     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):
@@ -65,6 +66,10 @@ class LocalDeviceEnvironment(environment.Environment):
     return self._devices
 
   @property
+  def concurrent_adb(self):
+    return self._concurrent_adb
+
+  @property
   def incremental_install(self):
     return self._incremental_install