Create "AutoGenerator" base class and interface.

osu.Game/Rulesets/Replays/AutoGenerator.cs

@@ -0,0 +1,36 @@
+using osu.Game.Rulesets.Objects;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Replays
+{
+    public abstract class AutoGenerator<T> : IAutoGenerator
+        where T : HitObject
+    {
+        /// <summary>
+        /// Creates the auto replay and returns it.
+        /// Every subclass of OsuAutoGeneratorBase should implement this!
+        /// </summary>
+        public abstract Replay Generate();
+
+        #region Parameters
+
+        /// <summary>
+        /// The beatmap we're making.
+        /// </summary>
+        protected Beatmap<T> Beatmap;
+
+        #endregion
+
+        public AutoGenerator(Beatmap<T> beatmap)
+        {
+            Beatmap = beatmap;
+        }
+
+        #region Constants
+
+        // Shared amongst all modes
+        protected const double KEY_UP_DELAY = 50;
+
+        #endregion
+    }
+}