[Android] Add a configurable environment for devil/.

build/android/pylib/forwarder.py

Index: build/android/pylib/forwarder.py
diff --git a/build/android/pylib/forwarder.py b/build/android/pylib/forwarder.py
index 17a0114ee8acf8cdd88eaf4aebe59c7002249c20..ba4d51a5e36837af1be1e314a0430ee0d60aed2f 100644
--- a/build/android/pylib/forwarder.py
+++ b/build/android/pylib/forwarder.py
@@ -9,6 +9,7 @@ import logging
 import os
 import psutil
 
+from devil import devil_env
 from devil.utils import cmd_helper
 from pylib import constants
 from pylib import valgrind_tools
@@ -77,7 +78,7 @@ class Forwarder(object):
 
       device_serial = str(device)
       redirection_commands = [
-          ['--adb=' + constants.GetAdbPath(),
+          ['--adb=' + devil_env.config.adb_path,
            '--serial-id=' + device_serial,
            '--map', str(device_port), str(host_port)]
           for device_port, host_port in port_pairs]
@@ -197,11 +198,10 @@ class Forwarder(object):
     self._initialized_devices = set()
     self._device_to_host_port_map = dict()
     self._host_to_device_port_map = dict()
-    self._host_forwarder_path = os.path.join(
-        constants.GetOutDirectory(), 'host_forwarder')
+    self._host_forwarder_path = devil_env.config.forwarder_host_path
     assert os.path.exists(self._host_forwarder_path), 'Please build forwarder2'
-    self._device_forwarder_path_on_host = os.path.join(
-        constants.GetOutDirectory(), 'forwarder_dist')
+    self._device_forwarder_path_on_host = (
+        devil_env.config.forwarder_device_path)
     self._InitHostLocked()
 
   @staticmethod
@@ -216,7 +216,7 @@ class Forwarder(object):
     if not serial_with_port in instance._device_to_host_port_map:
       logging.error('Trying to unmap non-forwarded port %d', device_port)
       return
-    redirection_command = ['--adb=' + constants.GetAdbPath(),
+    redirection_command = ['--adb=' + devil_env.config.adb_path,
                            '--serial-id=' + serial,
                            '--unmap', str(device_port)]
     logging.info('Undo forwarding using command: %s', redirection_command)