Merge "Use NavBarHelper to keep shared initalizing state between nav/taskbar" into tm-qpr-dev am: 5142dafc53 am: 7336f5eedd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20500395

Change-Id: Ibcb8fc52f007251a25fb4c12e3cf9267682feda5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>