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This new OOBE/Login page will handle custom setup needed for
supervised/child accounts. At the moment this version does nothing and
simply shows a placeholder screen. It will only be shown if the user
has the "EnableSupervisionOnboardingScreens" feature enabled.

Bug: 958995
Change-Id: I2ddec65ddd25d7850a04b166ba332a86e47688e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594112
Commit-Queue: Lucas Tenório <ltenorio@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657423}