'Adds \'download_data\' specific options to the \'parser\' passed in.
Args:
parser: An instance of OptionsParser.'

def _PerformDownloadOptions(self, parser):

    self._PerformLoadOptions(parser)
    parser.add_option('--filename', type='string', dest='filename', action='store', help='The    name    of    the    file    where    output    data    is    to    be    written.    (Required)')
    parser.add_option('--kind', type='string', dest='kind', action='store', help='The    kind    of    the    entities    to    retrieve.')
    parser.add_option('--exporter_opts', type='string', dest='exporter_opts', help='A    string    to    pass    to    the    Exporter.initialize    method.')
    parser.add_option('--result_db_filename', type='string', dest='result_db_filename', action='store', help='Database    to    write    entities    to    for    download.')
    parser.add_option('--config_file', type='string', dest='config_file', action='store', help='Name    of    the    configuration    file.')
