Merge "Announce for accessiblity when taskbar is invoked/closed" into tm-qpr-dev am: d301c9b6

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/21735251



Change-Id: Ibdb3a308550727a8c03c83c99e1c8566b443e503
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>