Merge "Use a selector instead of loading resource for drop target." into sc-dev am: b1e51e2a3f am: 3fd162bff2

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

Change-Id: I495f890ee252100da07cb4dc9f52e6794c149b18