Merge "Add OWNERS block to manage slippage during migration." am: d2a5e78d7c am: 36d9a8ca34 am: 23bc103152 am: e41bc47450

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

Change-Id: Ied25a5fd6b8976cb00b7da4b88d15dcf8de5dc36