Writes a collection of path_info records for a client.

def WritePathInfos(self, client_id, path_infos):
    """Writes a collection of path_info records for a client."""
    try:
      self._MultiWritePathInfos({client_id: path_infos})
    except MySQLdb.IntegrityError as error:
      raise db.UnknownClientError(client_id=client_id, cause=error)