Centralise implementation of slider bars which display millisecond time values

osu.Game/Graphics/UserInterface/TimeSlider.cs

@@ -0,0 +1,15 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Localisation;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    /// <summary>
+    /// A slider bar which displays a millisecond time value.
+    /// </summary>
+    public class TimeSlider : OsuSliderBar<double>
+    {
+        protected override LocalisableString GetTooltipText(double value) => $"{value:N0} ms";
+    }
+}