Implement config persistence through BasicStorage

osu.Game/Configuration/OsuConfigManager.cs

@@ -2,6 +2,7 @@
 //Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Framework.Configuration;
+using osu.Framework.Platform;
 using osu.Game.GameModes.Play;
 using osu.Game.Online.API;
 
@@ -25,6 +26,10 @@ namespace osu.Game.Configuration
             Set(OsuConfig.VolumeMusic, 1.0, 0, 1);
             Set(OsuConfig.VolumeEffect, 1.0, 0, 1);
         }
+
+        public OsuConfigManager(BasicStorage storage) : base(storage)
+        {
+        }
     }
 
     enum OsuConfig

osu.Game/OsuGameBase.cs

@@ -7,6 +7,7 @@ using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.IO.Stores;
+using osu.Framework.Platform;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.IO;
 using osu.Game.Configuration;
@@ -21,7 +22,7 @@ namespace osu.Game
 {
     public class OsuGameBase : BaseGame
     {
-        internal OsuConfigManager Config = new OsuConfigManager();
+        internal OsuConfigManager Config;
         public BeatmapDatabase Beatmaps { get; private set; }
 
         protected override string MainResourceFile => @"osu.Game.Resources.dll";
@@ -76,6 +77,13 @@ namespace osu.Game
             };
         }
 
+        public override void SetHost(BasicGameHost host)
+        {
+            if (Config == null)
+                Config = new OsuConfigManager(host.Storage);
+            base.SetHost(host);
+        }
+
         protected override void Update()
         {
             base.Update();