Some display hardware can't do the transition from doze display states
to the on display state cleanly, so in order to hide any janky-ness of
the transition we force the display off and cover the screen with a
black surface. This lets us keep the screen black until SystemUI and the
display are both ready.
Bug: 63531607
Test: manual
Change-Id: I66bd483e5f01e1dbd5069465aa122828af5f1903
05e76fe38f