Add exit code for infra failures to testrunner script.

build/android/pylib/remote/device/remote_device_helper.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.
 
 """Common functions and Exceptions for remote_device_*"""
 
-class RemoteDeviceError(Exception):
+from pylib.base import base_error
+
+
+class RemoteDeviceError(base_error.BaseError):
   """Exception to throw when problems occur with remote device service."""
   pass
 
 
 def TestHttpResponse(response, error_msg):
   """Checks the Http response from remote device service.
 
   Args:
       response: response dict from the remote device service.
       error_msg: Error message to display if bad response is seen.
   """
   if response.status_code != 200:
     raise RemoteDeviceError(error_msg)