GitLab

So, the utilities can be used in ui/ozone/platform/wayland
in following CLs.
Also, along with the move, this CL introduces more error checks
and adds unittests.

Bug: 1140536
Test: Ran ui_base_unittests, exo_unittests. Quick manual tests with Lacros.
Change-Id: I5de661528f328fd0e79154f8011056d1816e0f41
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489107
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822705}