Merge "Add MediaRouterManager.Callback#onSessionReleased" into rvc-dev am: 2950ebf0 am: 2957b1e0 am: 6c4fe66b am: 58ee368c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11733425

Change-Id: If80562e470da1b7cff9dedade60ff406cdfbef3e