Merge "MediaRouter: Route setBluetoothA2dpOn() via MediaRouterService" into sc-qpr1-dev am: 2c7ec2cbf5 am: 69618c276c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16044773

Change-Id: If5f1b1d518dee9002657c14d65d47790011639f2