src/media/sessions/service.config

{
    "services": {
        "fuchsia.media.sessions2.ActiveSession": "fuchsia-pkg://fuchsia.com/mediasession#meta/mediasession.cmx",
        "fuchsia.media.sessions2.Discovery": "fuchsia-pkg://fuchsia.com/mediasession#meta/mediasession.cmx",
        "fuchsia.media.sessions2.Publisher": "fuchsia-pkg://fuchsia.com/mediasession#meta/mediasession.cmx"
    }
}