When on the lock screen, and going to AOD animated, user would
temporarily see the system wallpaper. That's not what we want,
we want to fade from semi-transparent black to black, on top
of the backdrop - lock screen wallpaper or media art.
Test: press power on the lock screen when playing media
Test: press power on the lock screen after dismissing media
Test: unlock from AOD
Test: atest packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
Fixes: 80575770
Change-Id: I6796e844add889ff86be0cd2052db7c5d5073039
f8463ee043