Merge "Add information about requestAddControl" into rvc-dev am: c139a007 am: 505353d6 am: 3b1ddb88 am: a8e7c95c

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

Change-Id: Ieea9dd6974f3c6f8a54097c88ae3738ee04154f3