Merge "Reorganize taskbar controllers" into sc-v2-dev am: 51edca003c am: 3f0f5df8bf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14923145

Change-Id: I56902c21fe4f1000cb528e6d0acfe5cf6805fc39