docs: def AddFiles(self, hash_id_metadatas):
      """Adds multiple files to the file store.
  
      Args:
        hash_id_metadatas: A dictionary mapping hash ids to file metadata (a tuple
          of hash client path and blob references).
      """
      for hash_id, metadata in iteritems(hash_id_metadatas):
        self.AddFile(hash_id, metadata)