Merge "Use a selector instead of loading resource for drop target." into sc-dev am: b1e51e2a3f am: 4d296cc3d8

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

Change-Id: I1798f8a5f0b72ccbf6ab2b3d2d303e4674a7e5ab