[Android] Prepare build/android/ for catapult+devil.

build/android/pylib/instrumentation/instrumentation_test_instance_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 instrumentation.TestRunner."""
 
-# pylint: disable=W0212
-
-import os
-import sys
 import unittest
 
-from pylib import constants
 from pylib.base import base_test_result
+from pylib.constants import host_paths
 from pylib.instrumentation import instrumentation_test_instance
 
-sys.path.append(os.path.join(
-    constants.DIR_SOURCE_ROOT, 'third_party', 'pymock'))
-import mock  # pylint: disable=F0401
+with host_paths.SysPath(host_paths.PYMOCK_PATH):
+  import mock  # pylint: disable=import-error
 
 
 class InstrumentationTestInstanceTest(unittest.TestCase):
 
   def setUp(self):
     options = mock.Mock()
     options.tool = ''
 
   def testGenerateTestResults_noStatus(self):
     results = instrumentation_test_instance.GenerateTestResults(
@@ skipping 87 matching lines @@
     ]
     results = instrumentation_test_instance.GenerateTestResults(
         None, None, statuses, 0, 1000)
     self.assertEqual(1, len(results))
     self.assertEqual(base_test_result.ResultType.FAIL, results[0].GetType())
     self.assertEqual(stacktrace, results[0].GetLog())
 
 
 if __name__ == '__main__':
   unittest.main(verbosity=2)