Factor out a system_properties interface for interacting with getprop/setprop.

build/android/pylib/utils/test_environment.py

 # Copyright 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.
 
 import logging
 import os
 import psutil
 
 from pylib import android_commands
 
 def _KillWebServers():
   for retry in xrange(5):
     for server in ['lighttpd', 'web-page-replay']:
       pids = [p.pid for p in psutil.process_iter() if server in p.name]
       for pid in pids:
         try:
           logging.warning('Killing %s %s', server, pid)
           os.kill(pid, signal.SIGQUIT)
         except Exception as e:
           logging.warning('Failed killing %s %s %s', server, pid, e)
 
 
 def CleanupLeftoverProcesses():
   """Clean up the test environment, restarting fresh adb and HTTP daemons."""
   _KillWebServers()
   did_restart_host_adb = False
   for device in android_commands.GetAttachedDevices():
-    adb = android_commands.AndroidCommands(device)
+    adb = android_commands.AndroidCommands(device, api_strict_mode=True)
     # Make sure we restart the host adb server only once.
     if not did_restart_host_adb:
       adb.RestartAdbServer()
       did_restart_host_adb = True
     adb.RestartAdbdOnDevice()
     adb.EnableAdbRoot()
     adb.WaitForDevicePm()