Create MusicController UI class and visual test.

osu.Desktop.VisualTests/Tests/TestCaseMusicController.cs

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+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using osu.Framework.Graphics;
+using osu.Framework.GameModes.Testing;
+using osu.Game.Overlays;
+
+namespace osu.Desktop.Tests
+{
+    class TestCaseMusicController : TestCase
+    {
+        public override string Name => @"Music Controller";
+        public override string Description => @"Tests music controller ui.";
+
+        public override void Reset()
+        {
+            base.Reset();
+            MusicController mc = new MusicController
+            {
+                Origin = Anchor.Centre,
+                Anchor = Anchor.Centre
+            };
+            Add(mc);
+            AddToggle(@"Show", mc.ToggleVisibility);
+        }
+    }
+}