[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 440305c51c648e12fea49c7638c1d4c4a3bf3a34..7394fb56962e586f5110ecdc1da3571e6a62c792 100755
--- a/build/android/devil/android/md5sum_test.py
+++ b/build/android/devil/android/md5sum_test.py
@@ -7,23 +7,26 @@ 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'))
+devil_env.InitializeForTests()
+sys.path.append(devil_env.instance.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):
     self._patchers = [
-        mock.patch('pylib.constants.GetOutDirectory',
-                   new=mock.Mock(return_value=TEST_OUT_DIR)),
+        mock.patch('devil.devil_env._Environment.md5sum_host_path',
+                   new=mock.PropertyMock(return_value=HOST_MD5_EXECUTABLE)),
+        mock.patch('devil.devil_env._Environment.md5sum_device_path',
+                   new=mock.PropertyMock(return_value=MD5_DIST)),
         mock.patch('os.path.exists',
                    new=mock.Mock(return_value=True)),
     ]