Properly report xcb_connect failures in DisplayVkXcb Bug: chromium:1223431 Change-Id: Iaefddbda3fef283eed365fe010ee003a3b3beca8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3083383 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org>