Make backward-forward compatible version.

appengine/swarming/message_conversion.py

 # Copyright 2015 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.
 
 """This module facilitates conversion from dictionaries to ProtoRPC messages.
 
 Given a dictionary whose keys' names and values' types comport with the
 fields defined for a protorpc.messages.Message subclass, this module tries to
 generate a Message instance that corresponds to the provided dictionary. The
 "normal" use case is for ndb.Models which need to be represented as a
@@ skipping 167 matching lines @@
 
   properties = _rpc_to_ndb(
       task_request.TaskProperties,
       props,
       caches=[_rpc_to_ndb(task_request.CacheEntry, c) for c in props.caches],
       cipd_input=cipd_input,
       # Passing command=None is supported at API level but not at NDB level.
       command=props.command or [],
       has_secret_bytes=secret_bytes is not None,
       secret_bytes=None, # ignore this, it's handled out of band
-      dimensions={i.key: i.value for i in props.dimensions},
+      dimensions=None,
+      dimensions_dict={i.key: i.value for i in props.dimensions},
+      dimensions_flat=[],
       env={i.key: i.value for i in props.env},
       inputs_ref=inputs_ref)
 
   req = _rpc_to_ndb(
       task_request.TaskRequest,
       msg,
       created_ts=now,
       expiration_ts=now+datetime.timedelta(seconds=msg.expiration_secs),
       # It is set in task_request.init_new_request().
       authenticated=None,
@@ skipping 56 matching lines @@
     kwargs['run_id'] = entity.task_id
   else:
     assert entity.__class__ is task_result.TaskResultSummary, entity
     kwargs['properties_hash'] = (
         entity.properties_hash.encode('hex')
         if entity.properties_hash else None)
     # This returns the right value for deduped tasks too.
     k = entity.run_result_key
     kwargs['run_id'] = task_pack.pack_run_result_key(k) if k else None
   return _ndb_to_rpc(swarming_rpcs.TaskResult, entity, **kwargs)