Merge "Add LightRevealScrim to dumpsys to rule it out as the cause of an elusive bug." into sc-dev am: 1afbd3c9c8 am: 9753715c8e

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

Change-Id: I47c6b0de31ef26f580ac1d8543c46d3f85637197