Rename watchPerformance to watch

sky/sdk/lib/widgets/popup_menu.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import 'package:sky/animation/animation_performance.dart';
 import 'package:sky/painting/box_painter.dart';
@@ skipping 73 matching lines @@
     assert(_closeTimer == null);
     _closeTimer = new Timer(_kMenuCloseDelay, performance.reverse);
 
     return _closeCompleter.future;
   }
 }
 
 class PopupMenu extends AnimatedComponent {
 
   PopupMenu({ String key, this.controller, this.items, this.level })
-      : super(key: key) {
-    _painter = new BoxPainter(new BoxDecoration(
-      backgroundColor: Grey[50],
-      borderRadius: 2.0,
-      boxShadow: shadows[level]));
-    watchPerformance(controller.performance);
-  }
+      : 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]));
+    watch(controller.performance);
+  }
+
   void syncFields(PopupMenu source) {
     controller = source.controller;
     items = source.items;
     level = source.level;
     _painter = source._painter;
     super.syncFields(source);
   }
 
   BoxPainter _painter;
 
@@ skipping 41 matching lines @@
                 )
               )
             )
           )
         )
       )
     );
   }
 
 }