Add GPL modules

MediaBrowser.Controller/Session/ISessionController.cs

@@ -0,0 +1,25 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Session
+{
+    public interface ISessionController
+    {
+        /// <summary>
+        /// Gets a value indicating whether this instance is session active.
+        /// </summary>
+        /// <value><c>true</c> if this instance is session active; otherwise, <c>false</c>.</value>
+        bool IsSessionActive { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether [supports media remote control].
+        /// </summary>
+        /// <value><c>true</c> if [supports media remote control]; otherwise, <c>false</c>.</value>
+        bool SupportsMediaControl { get; }
+
+        /// <summary>
+        /// Sends the message.
+        /// </summary>
+        Task SendMessage<T>(string name, string messageId, T data, ISessionController[] allControllers, CancellationToken cancellationToken);
+    }
+}