Merge "Make taskbar accessibility announcement when user is in app only." into...

Merge "Make taskbar accessibility announcement when user is in app only." into tm-qpr-dev am: 6fcdfb16 am: 857c24a3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/22244591



Change-Id: Id5f8e3634a7560a2b0a453421d6b592515381567
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>