Add --output option to Swarming client and pass it through to the bot

appengine/swarming/test_env_handlers.py

 # coding: utf-8
 # Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Base class for handlers_*_test.py"""
 
 import base64
 import json
 import os
@@ skipping 208 matching lines @@
         }],
         'server': 'https://chrome-infra-packages.appspot.com',
       },
       'dimensions': [
         {'key': 'os', 'value': 'Amiga'},
         {'key': 'pool', 'value': 'default'},
       ],
       'env': [],
       'execution_timeout_secs': 3600,
       'io_timeout_secs': 1200,
+      'outputs': ['foo', 'path/to/foobar']
     }
     props.update(properties or {})
 
     params = {
       'expiration_secs': 24*60*60,
       'name': 'hi',
       'priority': 10,
       'properties': props,
       'tags': [],
       'user': 'joe@localhost',
@@ skipping 17 matching lines @@
 
   def client_create_task_raw(self, properties=None, **kwargs):
     """Creates a raw command TaskRequest via the Cloud Endpoints API."""
     properties = (properties or {}).copy()
     properties['command'] = ['python', 'run_test.py']
     return self._client_create_task(properties, **kwargs)
 
   def client_get_results(self, task_id):
     return self.endpoint_call(
         handlers_endpoints.SwarmingTaskService, 'result', {'task_id': task_id})