Add OOBE UI Zero touch end-to-end test.

Bug: 883985
Change-Id: If43f93fe27ce84fddc098aca8870b3cc729d7541
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692168
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675714}
8 files changed