Add exit code for infra failures to testrunner script.

build/android/pylib/remote/device/remote_device_environment.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Environment setup and teardown for remote devices."""
 
 import distutils.version
 import json
 import logging
 import os
@@ skipping 284 matching lines @@
   def _GetDeviceList(self):
     with appurify_sanitized.SanitizeLogging(self._verbose_count,
                                             logging.WARNING):
       dev_list_res = appurify_sanitized.api.devices_list(self._access_token)
     remote_device_helper.TestHttpResponse(dev_list_res,
                                          'Unable to generate access token.')
     return dev_list_res.json()['response']
 
   def _NoDeviceFound(self):
     self._PrintAvailableDevices(self._GetDeviceList())
-    raise remote_device_helper.RemoteDeviceError('No device found.')
+    raise remote_device_helper.RemoteDeviceError(
+        'No device found.', is_infra_error=True)
 
   @property
   def collect(self):
     return self._collect
 
   @property
   def device_type_id(self):
     return self._device['device_type_id']
 
   @property
@@ skipping 25 matching lines @@
   def trigger(self):
     return self._trigger
 
   @property
   def verbose_count(self):
     return self._verbose_count
 
   @property
   def device_type(self):
     return self._device_type