[Android] Add a configurable environment for devil/.

build/android/devil/android/md5sum_test.py

Index: build/android/devil/android/md5sum_test.py
diff --git a/build/android/devil/android/md5sum_test.py b/build/android/devil/android/md5sum_test.py
index e9481b65080181c606d4269822908145ddccf5c9..4cb5094714507f21f4c61099dc799ef5ad56aeab 100755
--- a/build/android/devil/android/md5sum_test.py
+++ b/build/android/devil/android/md5sum_test.py
@@ -7,25 +7,29 @@ import os
 import sys
 import unittest
 
+from devil import devil_env
 from devil.android import device_errors
 from devil.android import md5sum
-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=import-error
 
 TEST_OUT_DIR = os.path.join('test', 'out', 'directory')
 HOST_MD5_EXECUTABLE = os.path.join(TEST_OUT_DIR, 'md5sum_bin_host')
+MD5_DIST = os.path.join(TEST_OUT_DIR, 'md5sum_dist')
 
 class Md5SumTest(unittest.TestCase):
 
   def setUp(self):
+    mocked_attrs = {
+      'md5sum_host_path': HOST_MD5_EXECUTABLE,
+      'md5sum_device_path': MD5_DIST,
+    }
     self._patchers = [
-        mock.patch('pylib.constants.GetOutDirectory',
-                   new=mock.Mock(return_value=TEST_OUT_DIR)),
-        mock.patch('os.path.exists',
-                   new=mock.Mock(return_value=True)),
+      mock.patch('devil.devil_env._Environment.__getattr__',
+                 mock.Mock(side_effect=lambda a: mocked_attrs[a])),
+      mock.patch('os.path.exists',
+                 new=mock.Mock(return_value=True)),
     ]
     for p in self._patchers:
       p.start()