Run layout when exiting window

Such that a layout with canAffectSystemUiFlags() return false
happens immediately after starting the exit animation.

Test: Open dialog on top of light bar app, close dialog, observe
icons changing color in sync with window animation
Test: go/wm-smoke
Fixes: 77690715

Change-Id: I8c255a34f91c47261c1d14174f620142a2c49eb7
1 file changed