Rewrite syncplay using a state design pattern

MediaBrowser.Controller/SyncPlay/PlaybackRequest/ReadyGroupRequest.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Threading;
+using MediaBrowser.Model.SyncPlay;
+using MediaBrowser.Controller.Session;
+
+namespace MediaBrowser.Controller.SyncPlay
+{
+    /// <summary>
+    /// Class BufferingDoneGroupRequest.
+    /// </summary>
+    public class ReadyGroupRequest : IPlaybackGroupRequest
+    {
+        /// <summary>
+        /// Gets or sets when the request has been made by the client.
+        /// </summary>
+        /// <value>The date of the request.</value>
+        public DateTime When { get; set; }
+
+        /// <summary>
+        /// Gets or sets the position ticks.
+        /// </summary>
+        /// <value>The position ticks.</value>
+        public long PositionTicks { get; set; }
+
+        /// <summary>
+        /// Gets or sets the playing item id.
+        /// </summary>
+        /// <value>The playing item id.</value>
+        public Guid PlayingItemId { get; set; }
+
+        /// <inheritdoc />
+        public PlaybackRequestType Type()
+        {
+            return PlaybackRequestType.Ready;
+        }
+
+        /// <inheritdoc />
+        public bool Apply(ISyncPlayStateContext context, ISyncPlayState state, SessionInfo session, CancellationToken cancellationToken)
+        {
+            return state.HandleRequest(context, false, this, session, cancellationToken);
+        }
+    }
+}