GitLab

Switch to an atomic variable to ensure that getter and setter do not have a data
race.

Bug: 859155
Change-Id: Ib5ab1968cc8e25ab363fb4ed0b3f2e756d9cc984
Reviewed-on: https://chromium-review.googlesource.com/1240634
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594079}