Merge "Add MediaRouterManager.Callback#onSessionReleased" into rvc-dev am: 2950ebf07d am: 2957b1e0fe

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

Change-Id: Ic995fd7d9390fa2ff243cc936875c99c29830b4d