[Android] Add a custom pylintrc for build/android/.

build/android/pylib/perf/perf_control.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 atexit
 import logging
 
 from devil.android import device_errors
-from devil.android import device_utils
 
 
 class PerfControl(object):
   """Provides methods for setting the performance mode of a device."""
   _CPU_PATH = '/sys/devices/system/cpu'
   _KERNEL_MAX = '/sys/devices/system/cpu/kernel_max'
 
   def __init__(self, device):
     self._device = device
     # this will raise an AdbCommandFailedError if no CPU files are found
@@ skipping 128 matching lines @@
     """
     if self._have_mpdecision:
       script = 'stop mpdecision' if force_online else 'start mpdecision'
       self._device.RunShellCommand(script, check_return=True, as_root=True)
 
     if not self._have_mpdecision and not self._AllCpusAreOnline():
       logging.warning('Unexpected cpu hot plugging detected.')
 
     if force_online:
       self._ForEachCpu('echo 1 > "$CPU/online"')