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This CL moves some test code to X11 utils and makes Ozone using it.

Bug: 1121952
Change-Id: I4fdd95838f200960db0c232adfb56c6f25b6511a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524534
Auto-Submit: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#825646}