Merge "perfboot.py: ignore tags not listed in /system/etc/event-log-tags"

                      '|'.join(tags))

def filter_event_tags(tags, device):

    """Drop unknown tags not listed in device's event-log-tags file."""

    device.wait()

    supported_tags = set()

    for l in device.shell(['cat', '/system/etc/event-log-tags']).splitlines():

        tokens = l.split(' ')

        if len(tokens) >= 2:

            supported_tags.add(tokens[1])

    filtered = []

    for tag in tags:

        if tag in supported_tags:

            filtered.append(tag)

        else:

            logging.warning('Unknown tag \'%s\'. Ignoring...', tag)

    return filtered

def get_values(record, tag):

    """Gets values that matches |tag| from |record|."""

    keys = [key for key in record.keys() if key[0] == tag]

    check_dm_verity_settings(device)

    record_list = []

    event_tags = read_event_tags(args.tags)

    event_tags = filter_event_tags(read_event_tags(args.tags), device)

    init_perf(device, args.output, record_list, event_tags)

    interval_adjuster = IntervalAdjuster(args.interval, device)

    event_tags_re = make_event_tags_re(event_tags)