Merge "Add transient taskbar UI" into tm-qpr-dev am: 661f38cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/20197462



Change-Id: I91430a307d76ec249f1f5b711a03fbaffefd6351
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>