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: f392f02f

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



Change-Id: I9b66fd7cad6ee6804101a8ef0feca75b25b3986a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>