[Android] Parallelize provision_devices.py.

build/android/pylib/device/device_utils.py

Index: build/android/pylib/device/device_utils.py
diff --git a/build/android/pylib/device/device_utils.py b/build/android/pylib/device/device_utils.py
index 8a8de22519f3d69bc93681657494ed076eaeba05..c3711dd7f360f306f5f4a387ca94cbef2acdb8ec 100644
--- a/build/android/pylib/device/device_utils.py
+++ b/build/android/pylib/device/device_utils.py
@@ -60,12 +60,16 @@ class DeviceUtils(object):
                        operation should be retried on failure if no explicit
                        value is provided.
     """
+    self.adb = None
     self.old_interface = None
     if isinstance(device, basestring):
+      self.adb = adb_wrapper.AdbWrapper(device)
       self.old_interface = pylib.android_commands.AndroidCommands(device)
     elif isinstance(device, adb_wrapper.AdbWrapper):
+      self.adb = device
       self.old_interface = pylib.android_commands.AndroidCommands(str(device))
     elif isinstance(device, pylib.android_commands.AndroidCommands):
+      self.adb = adb_wrapper.AdbWrapper(device.GetDevice())
       self.old_interface = device
     elif not device:
       self.old_interface = pylib.android_commands.AndroidCommands()
@@ -701,7 +705,14 @@ class DeviceUtils(object):
     Raises:
       CommandTimeoutError on timeout.
     """
+    is_persist_property = property_name.startswith('persist.')
+    if is_persist_property:
+      self._RunShellCommandImpl('stop')

[tonyg, 2014/08/15 17:19:43]

Seems like this should be in system_properties, no?

[jbudorick, 2014/08/15 17:41:47]

It could be, although I'm plotting to get rid of system_properties as part of
the rewrite, (which, at the moment, is a little far down on my priorities list).

     self.old_interface.system_properties[property_name] = value
+    if is_persist_property:
+      self.adb.WaitForDevice()
+      self._RunShellCommandImpl('start')
+      self.old_interface.WaitForDevicePm()
 
   @decorators.WithTimeoutAndRetriesFromInstance()
   def GetPids(self, process_name, timeout=None, retries=None):