Merge "[Media] Add a MediaController.Callback that will disconnect us when onSessionDestroyed is triggered." into tm-dev am: 254bb547 am: 81154b8c am: cf655063 am: 9ec2e848

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18143686



Change-Id: I4db49fc6be4704a1b7a210d17fdccc6f1bd854d3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>