Turn off Effen render times printing

sky/framework/fn.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.
 
 library fn;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'reflect.dart' as reflect;
 
 bool _initIsInCheckedMode() {
   String testFn(i) { double d = i; return d.toString(); }
   try {
     testFn('not a double');
   } catch (ex) {
     return true;
   }
   return false;
 }
 
 final bool _isInCheckedMode = _initIsInCheckedMode();
-final bool _shouldLogRenderDuration = true;
+final bool _shouldLogRenderDuration = false;
 
 class Style {
   final String _className;
   static final Map<String, Style> _cache = new HashMap<String, Style>();
 
   static int _nextStyleId = 1;
 
   static String _getNextClassName() { return "style${_nextStyleId++}"; }
 
   Style extend(Style other) {
@@ skipping 728 matching lines @@
 
       _sync(null, _host, null);
       assert(_root is sky.Node);
 
       sw.stop();
       if (_shouldLogRenderDuration)
         print("Initial build: ${sw.elapsedMicroseconds} microseconds");
     });
   }
 }