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: 64d0e6f3 am: e2426c48

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

Change-Id: I268738c0312b6a158599d9487f09b753c91ba36a