GitLab

Add UI for confirmation code page and installing profile using a
confirmation code.

Screenshot:
https://screenshot.googleplex.com/BECB5ziR3vFEt6a.png

Bug: 1093185
Change-Id: Iec4fcfb08f501495b640834e404f34dc69b5f9db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2616733
Commit-Queue: Gordon Seto <gordonseto@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841742}