[Android] Add a configurable environment for devil/. (RELAND)

build/android/devil/android/device_temp_file_test.py

 #!/usr/bin/env python
 # 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.
 
 """
 Unit tests for the contents of device_temp_file.py.
 """
 
 import logging
-import os
 import sys
 import unittest
 
+from devil import devil_env
 from devil.android import device_errors
 from devil.android import device_temp_file
 from devil.android.sdk import adb_wrapper
 from devil.utils import mock_calls
-from pylib import constants
 
-sys.path.append(os.path.join(
-    constants.DIR_SOURCE_ROOT, 'third_party', 'pymock'))
+sys.path.append(devil_env.config.pymock_path)
 import mock # pylint: disable=F0401
 
 class DeviceTempFileTest(mock_calls.TestCase):
 
   def setUp(self):
     test_serial = '0123456789abcdef'
     self.adb = mock.Mock(spec=adb_wrapper.AdbWrapper)
     self.adb.__str__ = mock.Mock(return_value=test_serial)
     self.watchMethodCalls(self.call.adb)
 
@@ skipping 49 matching lines @@
       with tempFileContextManager as tmpfile:
         logging.debug('Temp file name: %s', tmpfile.name)
         self.assertEquals(0, self.adb.Shell.call_count)
       self.assertEquals(1, self.adb.Shell.call_count)
       args, _ = self.adb.Shell.call_args
       self.assertTrue(args[0].startswith('rm -f '))
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.DEBUG)
   unittest.main(verbosity=2)