Merge "Overlap navbar with letterboxed immersive app" into udc-dev am: 413f5c5a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23048497



Change-Id: I3942b3004dd7453123b859ed724e7d12b040125b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>