Merge "Add OWNERS block to manage slippage during migration." am: d2a5e78d7c am: 36d9a8ca34 am: 23bc103152

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1950196

Change-Id: I9a2de5b8edc28e49429e89c96e861d8ba910d312