GitLab

Add 'Time out' sheet model to show when Web Authentication request
times-out due to inactivity or error.

Bug: 849323
Change-Id: Ifda965c3120d4fbd28f46a4f62e88200f316ca0f
Reviewed-on: https://chromium-review.googlesource.com/1105284
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Kim Paulhamus <kpaulhamus@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572325}