GitLab

It sometimes draws bad wallpaper image.
Temporarily disable while investigating the cause.
(could be an issue on gpu/driver, and in that case it will stay)

Bug: 1020500
Test: manually tested on minnie
Change-Id: I141f04eda13ce2c1280102b9fccdb2933c3456b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912833Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714800}