Disable media transfer protocol on android devices.

build/android/pylib/device_settings.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
 
 from pylib import content_settings
 
 
 def ConfigureContentSettingsDict(device, desired_settings):
@@ skipping 17 matching lines @@
   except ValueError:
     logging.error('Skipping content settings configuration, unknown sdk %s',
                   device.old_interface.system_properties[
                       'ro.build.version.sdk'])
     return
 
   if sdk_version < 16:
     logging.error('Skipping content settings configuration due to outdated sdk')
     return
 
+  device.old_interface.system_properties['persist.sys.usb.config'] = 'adb'
+  device.old_interface.WaitForDevicePm()
+
   for table, key_value in sorted(desired_settings.iteritems()):
     settings = content_settings.ContentSettings(table, device)
     for key, value in key_value.iteritems():
       settings[key] = value
     logging.info('\n%s %s', table, (80 - len(table)) * '-')
     for key, value in sorted(settings.iteritems()):
       logging.info('\t%s: %s', key, value)
 
 
 DETERMINISTIC_DEVICE_SETTINGS = {
@@ skipping 54 matching lines @@
   },
 }
 
 
 NETWORK_DISABLED_SETTINGS = {
   'settings/global': {
     'airplane_mode_on': 1,
     'wifi_on': 0,
   },
 }