Merge "Add MediaRouterManager.Callback#onSessionReleased" into rvc-dev am: 2950ebf0 am: 2957b1e0 am: 749fa554 am: fc4edbdc

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

Change-Id: Icfa7fd10ca8ddab532b7cb7f970c0f40044747ad