Merge "Introduce system API to get source of user restriction" into nyc-dev
am: 690c2ea117

* commit '690c2ea117f90b7759ac280a1c84f5966b1e7938':
  Introduce system API to get source of user restriction

Change-Id: Iec3a08471bc56a3aec1aff43b3c7361931c13539