Add Phaser.GameObjects.UpdateList#length

Author: samme

src/gameobjects/UpdateList.js

@@ -216,7 +216,7 @@ var UpdateList = new Class({
         {
             this._list.splice(index, 1);
         }
-        
+
         return child;
     },
 
@@ -277,6 +277,23 @@ var UpdateList = new Class({
 
         this.scene = null;
         this.systems = null;
+    },
+
+    /**
+     * [description]
+     *
+     * @name Phaser.GameObjects.UpdateList#length
+     * @type {integer}
+     * @readOnly
+     * @since 3.10.0
+     */
+    length: {
+
+        get: function ()
+        {
+            return this._list.length;
+        }
+
     }
 
 });