GitLab

Adds a temporary UI that displays the list of accounts currently on the
device when a user selects sign-in on the web.

https://drive.google.com/file/d/1uBEdtsq3MPDaAas7sVSRWWEsqqk_avCo/view?usp=sharing

Bug: 1125631
Change-Id: I225a6f81bbe677458a062b7ad78b1491d4c8b2f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411934Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Nohemi Fernandez <fernandex@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807520}