GitLab

Make ShutdownController pass the actual cause of a shutdown
request (power button, system tray, or login screen) to
powerd rather just a generic "UI request from ash" string.

Also get rid of an "unknown" ShutdownReason enum value that
looks like it was just used as an initial placeholder within
LockStateController.

Bug: none
Change-Id: I0760e68a6bf462c508d1f2d8740b8e6a1cf31191
Reviewed-on: https://chromium-review.googlesource.com/933546Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Qiang Xu <warx@google.com>
Commit-Queue: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538896}