swarming: add transaction_id to tasks.new request

appengine/swarming/server/task_pack.py

 # coding: utf-8
 # 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.
 
 """Packing and unpacking of ndb.Key.
 
 End users are only given packed keys, which permits to not expose internal
 schema details to the user.
 """
@@ skipping 60 matching lines @@
   """Returns the PerformanceStats ndb.Key for this TaskRunResult.key.
   """
   assert run_result_key.kind() == 'TaskRunResult', run_result_key
   return ndb.Key('PerformanceStats', 1, parent=run_result_key)
 
 
 ### Packing and unpacking.
 
 
 def get_request_and_result_keys(task_id):
-  """Provides the key and TaskRequest corresponding to a task ID.
+  """Provides request and result keys corresponding to a task ID.
 
   Returns:
     tuple(request_key, result_key): ndb.Key that yield TaskRequest and either
-                                    (TaskRunResult or TaskResultSummay).
+                                    (TaskRunResult or TaskResultSummary).
   """
   try:
     key = unpack_result_summary_key(task_id)
     request_key = result_summary_key_to_request_key(key)
   except ValueError:
     key = unpack_run_result_key(task_id)
     request_key = result_summary_key_to_request_key(
         run_result_key_to_result_summary_key(key))
   return request_key, key
 
@@ skipping 68 matching lines @@
   """Returns the TaskRunResult ndb.Key from a packed key.
 
   The expected format of |packed_key| is %x.
   """
   request_key = unpack_request_key(packed_key[:-1])
   run_id = int(packed_key[-1], 16)
   if not run_id:
     raise ValueError('Can\'t reference to the overall task result.')
   result_summary_key = request_key_to_result_summary_key(request_key)
   return result_summary_key_to_run_result_key(result_summary_key, run_id)