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--enable-demo-mode switch turns on new demo mode feature that is under
development.
Ctrl+Alt+D shortcut opens new demo mode setup flow from OOBE (sign in screen).
It is used for development and might change in the future.

Change-Id: Ie3c0d954cd7d3d82f030873b9472debb1ebb2a1d
Bug: 812460
Reviewed-on: https://chromium-review.googlesource.com/914846Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537820}