GitLab

Add unittest that tests controls are frozen while we waiting for new
session.

Bug: 1128883
Change-Id: I37bc04d27366dcba3670da2038c7ba270c382b87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426506
Commit-Queue: Jazz Xu <jazzhsu@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811592}