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

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

Change-Id: I246afad583fa73c8e5be7f2a21d1d729aea87bf7