Merge "Notify System UI about taskbar state" into sc-v2-dev am: 6224eaea29 am: d258acb0b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15162411

Change-Id: Ifc44c34ce18153e1f94270406e68a7a2dccfff09