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

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



Change-Id: Idb501a05e5129efe35a49de870d05a517bfd7dee
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>