Merge "Add policies and enforce overlayable to header" into rvc-dev am:...

Merge "Add policies and enforce overlayable to header" into rvc-dev am: 2201f8b6 am: 1b4cda22 am: 84623398

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11481145

Change-Id: I6dc7a22f71b7fcd377729848c6607a8820ab2d27