Examples - Add Grid Size Up/Down Buttons

web/main.dart

@@ -112,7 +112,19 @@ void addControls(Example ex) {
       ..text = "Stop"
       ..onClick.listen((e) {
         ex.loop.stop();
-      })));
+      }))
+    ..append(new ButtonElement()
+      ..text = "+"
+      ..onClick.listen((e) {
+        ex.loop.game.changeGridSize(true);
+      }))
+    ..append(new ButtonElement()
+      ..text = "-"
+      ..onClick.listen((e) {
+        ex.loop.game.changeGridSize(false);
+      }))
+  );
+
 
   // Don't add controls which don't work anyways (for simple examples)
   if(examples.indexOf(ex) <= 1) return;