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This CL will add Oobe dialog state that is used to hide the "Add
person" or "Browse as Guest" buttons when an extensions show UI through
the chrome.loginScreenUi API.

API proposal: go/api-login-screen-ui
Design doc: go/dd-login-screen-extension-ui

Bug: 957573
Change-Id: Ifcdba5c3fce5ff3cc892c3d05c4524580cabd042
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1588555
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664428}