[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 24 matching lines @@
         message.append('with exit status %s ' % self.status)
       if output:
         message.append('and output:\n')
         message.extend('- %s\n' % line for line in output.splitlines())
       else:
         message.append('and no output.')
       message = ''.join(message)
     super(AdbCommandFailedError, self).__init__(message, device_serial)
 
 
+class DeviceVersionError(CommandFailedError):
+  """Exception for device version failures."""
+
+  def __init__(self, message, device_serial=None):
+    super(DeviceVersionError, self).__init__(message, device_serial)
+
+
 class AdbShellCommandFailedError(AdbCommandFailedError):
   """Exception for shell command failures run via adb."""
 
   def __init__(self, command, output, status, device_serial=None):
     self.command = command
     message = ['shell command run via adb failed on the device:\n',
                '  command: %s\n' % command]
     message.append('  exit status: %s\n' % status)
     if output:
       message.append('  output:\n')
@@ skipping 13 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.')