Merge "Add VcnContext, Vcn skeletons" am: ebc78a4cb5 am: 8337c53b5b am: 4823cfa27b am: fa726dbfea

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1495024

Change-Id: I77da6c5b31d45fb59a2a38000b6e593314ec8796