Merge "Add LightRevealScrim to dumpsys to rule it out as the cause of an elusive bug." into sc-dev am: 1afbd3c9c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15350198

Change-Id: I1da6562b1993747f5eeb2dfddb9613beffcd8456