Merge "Wait until activity present before calling onEndTargetCalculated()" into ub-launcher3-rvc-qpr-dev am: 032db3289a

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/12141305

Change-Id: Ib91c86e49145874b481554fa2382678eb03e4239