Merge "Set taskbar touchable region to empty when all apps is open." into...

Merge "Set taskbar touchable region to empty when all apps is open." into tm-dev am: 5ad574ae am: 18ebd464

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17158409

Change-Id: Ica7386d9d138075fcd2fe97ff5aaccf970084f87