[Android] Add a configurable environment for devil/.

build/android/devil/android/device_utils_test.py

Index: build/android/devil/android/device_utils_test.py
diff --git a/build/android/devil/android/device_utils_test.py b/build/android/devil/android/device_utils_test.py
index 471ef21edc2b2f7ad2a7b443ca37ebf30a931c7b..aada2974bb2fe83fa3dcd0b8cb7ee63fd0dbae76 100755
--- a/build/android/devil/android/device_utils_test.py
+++ b/build/android/devil/android/device_utils_test.py
@@ -11,10 +11,10 @@ Unit tests for the contents of device_utils.py (mostly DeviceUtils).
 # pylint: disable=unused-argument
 
 import logging
-import os
 import sys
 import unittest
 
+from devil import env
 from devil.android import device_errors
 from devil.android import device_signal
 from devil.android import device_utils
@@ -23,10 +23,8 @@ from devil.android.sdk import intent
 from devil.android.sdk import version_codes
 from devil.utils import cmd_helper
 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(env.dependencies.pymock_path)
 import mock # pylint: disable=F0401
 
 
@@ -57,6 +55,8 @@ class DeviceUtilsInitTest(unittest.TestCase):
 
 class DeviceUtilsGetAVDsTest(mock_calls.TestCase):
 
+  @mock.patch('devil.env.android_sdk_config.AndroidSdkConfig.root_path',
+              mock.PropertyMock(return_value='/my/android/sdk'))
   def testGetAVDs(self):
     with self.assertCall(
         mock.call.devil.utils.cmd_helper.GetCmdOutput(
@@ -67,8 +67,7 @@ class DeviceUtilsGetAVDsTest(mock_calls.TestCase):
         '  Target: Android 5.0 (API level 21)\n'
         ' Tag/ABI: default/x86\n'
         '    Skin: WVGA800\n'):
-      self.assertEquals(['my_android5.0'],
-                        device_utils.GetAVDs())
+      self.assertEquals(['my_android5.0'], device_utils.GetAVDs())
 
 
 class DeviceUtilsRestartServerTest(mock_calls.TestCase):