Merge "Use a selector instead of loading resource for drop target." into sc-dev am: b1e51e2a3f am: 8b52ff1ab0 am: 7668cbb9cc

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14817811

Change-Id: I37fd00e6f06c8ef94a12b33a0b3c2e92d49bd8dc