Add slipping prediction (#1440)

Content.Shared/GameObjects/EntitySystems/SlipperySystem.cs

@@ -0,0 +1,28 @@
+using Content.Shared.GameObjects.Components.Movement;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Systems;
+
+namespace Content.Shared.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class SlipperySystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            EntityQuery = new TypeEntityQuery(typeof(SharedSlipperyComponent));
+        }
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            foreach (var entity in RelevantEntities)
+            {
+                entity.GetComponent<SharedSlipperyComponent>().Update(frameTime);
+            }
+        }
+    }
+}