Add support for repeated keys in TaskRequest.

appengine/swarming/server/task_result_test.py

 #!/usr/bin/env python
 # 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.
 
 import datetime
 import logging
 import os
 import random
 import sys
@@ skipping 17 matching lines @@
 from server import task_to_run
 
 
 # pylint: disable=W0212
 
 
 def _gen_request(properties=None, **kwargs):
   """Creates a TaskRequest."""
   props = {
     'command': [u'command1'],
-    'dimensions': {u'pool': u'default'},
+    'dimensions_flat': [u'pool:default'],
     'env': {},
     'execution_timeout_secs': 24*60*60,
     'io_timeout_secs': None,
   }
   props.update(properties or {})
-  props['dimensions_dict'] = props.pop('dimensions')
   now = utils.utcnow()
   args = {
     'created_ts': now,
     'name': 'Request name',
     'priority': 50,
     'properties': task_request.TaskProperties(**props),
     'expiration_ts': now + datetime.timedelta(seconds=60),
     'tags': [u'tag:1'],
     'user': 'Jesus',
   }
@@ skipping 639 matching lines @@
         task_result.TaskOutput.CHUNK_SIZE * '\x00' + 'Baz\x00Bar\x00FooWow',
         self.run_result.get_output())
     self.assertTaskOutputChunk(
         [{'chunk': 'Baz\x00Bar\x00FooWow', 'gaps': [3, 4, 7, 8]}])
 
 
 if __name__ == '__main__':
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()