make channel access opt-in rather than opt out

MediaBrowser.Controller/Session/ISessionController.cs

@@ -105,5 +105,15 @@ namespace MediaBrowser.Controller.Session
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task.</returns>
         Task SendServerRestartNotification(CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Sends the message.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="name">The name.</param>
+        /// <param name="data">The data.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task SendMessage<T>(string name, T data, CancellationToken cancellationToken);
     }
 }