Enable presubmit pylint in build/android.

build/android/pylib/screenshot.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 os
 import tempfile
 import time
 
-import android_commands
-import cmd_helper
+from pylib import cmd_helper
 
 
 def _GetTimestamp():
- return time.strftime('%Y-%m-%d-%H%M%S', time.localtime())
+  return time.strftime('%Y-%m-%d-%H%M%S', time.localtime())
 
 
 def _EnsureHostDirectory(host_file):
   host_dir = os.path.dirname(os.path.abspath(host_file))
   if not os.path.exists(host_dir):
     os.makedirs(host_dir)
 
 
 def TakeScreenshot(adb, host_file):
   """Saves a screenshot image to |host_file| on the host.
@@ skipping 76 matching lines @@
 
   def Pull(self):
     """Pull resulting video file from the device.
 
     Returns:
       Output video file name on the host.
     """
     self._adb.PullFileFromDevice(self._device_file, self._host_file)
     self._adb.RunShellCommand('rm -f "%s"' % self._device_file)
     return self._host_file