Adds multiple value<->timestamp pairs.

    Args:
      value_timestamp_pairs: Tuples of (value, timestamp).

def MultiAppend(self, value_timestamp_pairs):
    """Adds multiple value<->timestamp pairs.

    Args:
      value_timestamp_pairs: Tuples of (value, timestamp).
    """
    for value, timestamp in value_timestamp_pairs:
      self.Append(value, timestamp)