Merge "Avoid blur behind for layers that are fully opaque." into sc-dev am: 9d799fbba9 am: d47f746d63

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/14649087

Change-Id: Ied27e3dbbadc1becccf89d1ad0db707d57861019