docs: def WritePathHashHistory(self, client_path, hash_entries):
      """Writes a collection of `Hash` observed for particular path.
  
      Args:
        client_path: A `ClientPath` instance.
        hash_entries: A dictionary with timestamps as keys and `Hash` instances as
          values.
      """
      client_path_history = ClientPathHistory()
      for timestamp, hash_entry in iteritems(hash_entries):
        client_path_history.AddHashEntry(timestamp, hash_entry)
  
      self.MultiWritePathHistory({client_path: client_path_history})