Merge "Initial commit of taskbar stashing" into sc-v2-dev am: 0ac023196d am: a2be8926bd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14941111

Change-Id: I3da658073e4ad181c872021f3b4faa8d6a2d1160