Merge "[1/n] Add build and runtime flags for fullscreen option" into...

Merge "[1/n] Add build and runtime flags for fullscreen option" into udc-qpr-dev am: c2ec3a5a am: 4aff7c08

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24176523



Change-Id: I4f0fbe699b618533a222fa0a00affa3b0a84079f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>