GitLab

Adds basic UI tests for the consent, empty credentials and stale
credentials screens.

Bug: 1045448, 1045452, 1045453
Change-Id: I1b103fb09f84ddc2c1b1e8dd27d718a92541d75e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086232
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746720}