Rename watchPerformance to watch

sky/sdk/lib/widgets/popup_menu.dart

Index: sky/sdk/lib/widgets/popup_menu.dart
diff --git a/sky/sdk/lib/widgets/popup_menu.dart b/sky/sdk/lib/widgets/popup_menu.dart
index f5101e9899550877bb0e796a1c95634605bec50a..79bb6f6856f25a33efd971501c8a90578132c183 100644
--- a/sky/sdk/lib/widgets/popup_menu.dart
+++ b/sky/sdk/lib/widgets/popup_menu.dart
@@ -91,18 +91,20 @@ class PopupMenuController {
 class PopupMenu extends AnimatedComponent {
 
   PopupMenu({ String key, this.controller, this.items, this.level })
-      : super(key: key) {
+      : super(key: key);
+
+  PopupMenuController controller;
+  List<PopupMenuItem> items;
+  int level;
+
+  void initState() {
     _painter = new BoxPainter(new BoxDecoration(
       backgroundColor: Grey[50],
       borderRadius: 2.0,
       boxShadow: shadows[level]));
-    watchPerformance(controller.performance);
+    watch(controller.performance);
   }
 
-  PopupMenuController controller;
-  List<PopupMenuItem> items;
-  int level;
-
   void syncFields(PopupMenu source) {
     controller = source.controller;
     items = source.items;