'Used by workers to tell the service that the ActivityTask
identified by the taskToken completed successfully with a
result (if provided).
:type task_token: string
:param task_token: The taskToken of the ActivityTask.
:type result: string
:param result: The result of the activity task. It is a free
form string that is implementation specific.
:raises: UnknownResourceFault, SWFOperationNotPermittedError'

def respond_activity_task_completed(self, task_token, result=None):

    return self.json_request('RespondActivityTaskCompleted', {'taskToken': task_token, 'result': result})
