Merge "Add information about requestAddControl" into rvc-dev am: c139a007 am: 505353d6 am: 3b1ddb88

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

Change-Id: I968d887c4412bbe440e49e040c4f2a4deacfd120