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

Merge "Overlap navbar with letterboxed immersive app" into udc-dev am: 413f5c5a am: c6943d26 am: d6c250c0

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



Change-Id: I15943eef2ac2a8096759c295c61c8a9d00452628
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>