Merge "Initialize navigation mode for TaskbarDelegate" into tm-qpr-dev am:...

Merge "Initialize navigation mode for TaskbarDelegate" into tm-qpr-dev am: 961eece3 am: 5e2b9279

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20584048



Change-Id: I813f0c6c7ec2b40bd45c6ed6e6fb486c80b019b0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>