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This adds a 'MODE_OFFLINE_DEMO' enrollment mode, which locks the
device and applies the policy in the local installation. This
is the flow to setup the offline demo mode.

Currently the actual policy data is not yet available, so this
right now simply locks the device.

Bug: 827290
Change-Id: I6cdfec50049b017fc01d9875bd520f0655660031
Reviewed-on: https://chromium-review.googlesource.com/1000012Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Drew Wilson <atwilson@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553389}