Fix gesture events in fn2

sky/examples/game/lib/sprite_box.dart

Index: sky/examples/game/lib/sprite_box.dart
diff --git a/sky/examples/game/lib/sprite_box.dart b/sky/examples/game/lib/sprite_box.dart
index 5658dbd5b34fe0050f9b85057e86bb0bf264e836..6926200aed8e81103f9324bdd8e24f7781fc78ae 100644
--- a/sky/examples/game/lib/sprite_box.dart
+++ b/sky/examples/game/lib/sprite_box.dart
@@ -41,7 +41,7 @@ class SpriteBox extends RenderBox {
     size = constraints.constrain(new Size.infinite());
   }
 
-  void handlePointer(PointerEvent event) {
+  void handleEvent(Event event) {
     switch (event.type) {
       case 'pointerdown':
         print("pointerdown");