GitLab

This CL fixes an issue where buttons were not visible in immersive mode
due to being painted into layers. This has been fixed by disabling the
layers when entering immersive mode, which disables animations, but keeps
the buttons visible.

Bug: 787640
Change-Id: Ie34f71a30b7a3f995d01e11fdeb66ce49ab12c0f
Reviewed-on: https://chromium-review.googlesource.com/1004155
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550064}