Merge changes from topic "launcher-loading" into sc-v2-dev am: ca1ee7a161 am: b39c4e28e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15616248

Change-Id: Iac502320cec13689ba1fbb372f4869960020c857