[android] Create Battery Utils to seperate power functionality

build/android/pylib/device/device_errors.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.
 
 """
 Exception classes raised by AdbWrapper and DeviceUtils.
 """
 
 from pylib import cmd_helper
 from pylib.utils import base_error
@@ skipping 57 matching lines @@
 class DeviceUnreachableError(base_error.BaseError):
   """Exception for device unreachable failures."""
   pass
 
 
 class NoDevicesError(base_error.BaseError):
   """Exception for having no devices attached."""
 
   def __init__(self):
     super(NoDevicesError, self).__init__('No devices attached.')
+
+class DeviceVersionError(CommandFailedError):

[jbudorick, 2015/03/31 18:30:19]

nit: move this up, either before AdbCommandFailedError or before
CommandTimeoutError.

[rnephew (Wrong account), 2015/03/31 19:36:45]

Done.

+  """Exception for device version failures."""
+
+  def __init__(self, message, device_serial=None):
+    super(DeviceVersionError, self).__init__(message, device_serial)