Merge "Add LightRevealScrim to dumpsys to rule it out as the cause of an elusive bug." into sc-dev am: 1afbd3c9 am: 540a4a98 am: b6e80056

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

Change-Id: Iecf1ec69495e5110d9d66188f140c9e4e024ceee