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When a device is "derelict" (idle at OOBE), we currently auto-launch a
very old Kiosk demo app. This CL changes the idle detector to enroll
into offline Demo Mode instead if Demo Mode and offline Demo Mode are
enabled.

More specifically, "derelict" is defined as:
* Spending a total of 8 hours on the Welcome screen, followed by
* Being idle on the Welcome screen for 5 minutes

So a device that has progressed past the Welcome screen shouldn't be
considered derelict; nor should a device that goes idle for 5 minutes
but has only been in OOBE for <8 hours.

We will follow this CL  with actual derelict policies; until then it
will fail to enroll and simply return to the Welcome screen.

Bug: 869273
Test: browser_tests, and manually at OOBE with the following command line:
      --enable-demo-mode --enable-offline-demo-mode --derelict-idle-timeout=1
      --derelict-detection-timeout=1 --oobe-timer-interval=1
      (manual testing requires copying policies from
      /usr/share/chromeos-assets/demo_mode_resources/policy/ to
      /usr/share/chromeos-assets/demo_mode_resources/derelict_policy/)

Change-Id: I81572e447ce5082c0bf534ab32b0c4b34f0570a0
Reviewed-on: https://chromium-review.googlesource.com/1164398
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583927}