Merge "Add information about requestAddControl" into rvc-dev am: c139a007 am: 7bbfde81 am: 94e6900b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11973250

Change-Id: I5c0aa007136e2369957f1036d0e9ec9d7c1cfb78