GitLab

Add additional options for DeviceRebootOnUserSignout to allow rebooting
after a virtual machine (crostini or plugin VM) has been started.

Design Document:
https://docs.google.com/document/d/1cIZsPD6rwm6ca5r8GCXUqr2gT1axsoGe0S0Hl2-OgCE

Bug: 986755
Change-Id: Ida2a73e4d38897d13ddeeba53eb25c4311f2459d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1840634Reviewed-by: Bartosz Fabianowski <bartfab@chromium.org>
Commit-Queue: Victor-Gabriel Savu <vsavu@google.com>
Cr-Commit-Position: refs/heads/master@{#708974}