clients/simple-egl: add delay option

This emulates extra drawing work by usleep().

This is an enhancement to reproduce the problem in the bug report.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=98833
[Pekka: reordered the help text]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
1 file changed