Merge "Add a background scrim to launcher for text protection." into sc-dev am: f1d3cf02c9 am: dde42b46ab

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14243130

Change-Id: Id4dc2dead3df7eded16e71b5c24ba1ca71e9adf2