tree b7743130e75f664fd3e3f0e40e2bc660ea4a697a
parent 8a7e77e7b953973e31df86a1f6eaf50d35aee65b
author Steven Moreland <smoreland@google.com> 1521220994 -0700
committer Steven Moreland <smoreland@google.com> 1521230693 -0700

light service: mark as shutdown critical

Required because the lights need to be turned off late in boot
(e.x. during fsck for disk health), and before, blank_screen
accessing light encountered a race condition where if it didn't
get scheduled before all of the processes which were getting
shutdown were getting killed, the screen wouldn't blank.

Bug: 74976325
Test: adjusting brightness continues to work
Test: screen blanks during shutdown at the correct time
    including when an artificial 5s delay is inserted when
    the phone normally fscks (which can also be quick)

Change-Id: I57ebc11d7ecf57ee327c681455712f4b53de6fd3
Merged-In: I57ebc11d7ecf57ee327c681455712f4b53de6fd3