[Android] Add a configurable environment for devil/.

build/android/devil/android/device_utils.py

Index: build/android/devil/android/device_utils.py
diff --git a/build/android/devil/android/device_utils.py b/build/android/devil/android/device_utils.py
index 96de1f88ede2a293f61d19c1d0940c4614ea2082..9e5aef470e5545f180fd849a07666fd504fabfed 100644
--- a/build/android/devil/android/device_utils.py
+++ b/build/android/devil/android/device_utils.py
@@ -21,6 +21,7 @@ import time
 import zipfile
 
 from devil import base_error
+from devil import devil_env
 from devil.utils import cmd_helper
 from devil.android import apk_helper
 from devil.android import device_signal
@@ -39,7 +40,6 @@ from devil.utils import parallelizer
 from devil.utils import reraiser_thread
 from devil.utils import timeout_retry
 from devil.utils import zip_utils
-from pylib import constants
 from pylib.device.commands import install_commands
 
 _DEFAULT_TIMEOUT = 30
@@ -103,7 +103,7 @@ def GetAVDs():
     A list containing the configured AVDs.
   """
   lines = cmd_helper.GetCmdOutput([
-      os.path.join(constants.ANDROID_SDK_ROOT, 'tools', 'android'),
+      os.path.join(devil_env.config.android_sdk_path, 'tools', 'android'),
       'list', 'avd']).splitlines()
   avds = []
   for line in lines: