Merge "Launch multiple tasks at once" into sc-v2-dev am: 438f796626 am: e764643f0b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15705481

Change-Id: I51eea24df7b443045a7f38af032c013e46ea3a1e