GitLab

For now, just run with headless backend. Once Ozone/X11
is more mature and Weston is built from third_party (ongoing),
use --ozone-platform=wayland/x11 as well.

Bug: 700309
Change-Id: Ib869ab8cb0d8c3e98ccf322d7c9b226baeeaa974
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1735580
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684253}