update to polymer js 0.5.1

pkg/polymer/lib/src/loader.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of polymer;
 
 /// Annotation used to automatically register polymer elements.
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
@@ skipping 125 matching lines @@
   if (proto is Node) proto = new JsObject.fromBrowserObject(proto);
   return proto;
 }();
 
 // Add support for the polymer js style of enabling logging. The global logging
 // level is respected for specified loggers (see http://goo.gl/btfDe1). All
 // other loggers will be set to [Level.OFF]. Logs will also be printed to the
 // console automatically if any are supplied.
 void _initializeLogging() {
   hierarchicalLoggingEnabled = true;
-  var logFlags = js.context['logFlags'];
+  var webComponents = js.context['WebComponents'];
+  var logFlags = (webComponents == null || webComponents['flags'] == null) ? {}
+      : webComponents['flags']['log'];
   if (logFlags == null) logFlags = {};
   var loggers =
       [_observeLog, _eventsLog, _unbindLog, _bindLog, _watchLog, _readyLog];
   var polymerLogger = new Logger('polymer');
 
   // If no loggers specified then disable globally and return.
   if (!loggers.any((logger) => logFlags[logger.name] == true)) {
     polymerLogger.level = Level.OFF;
     return;
   }
@@ skipping 26 matching lines @@
     // Only alert once per waiting state.
     if (lastAlert == lastWaiting) return;
     lastAlert = lastWaiting;
 
     print('No elements registered in a while, but still waiting on '
         '${waiting.length} elements to be registered. Check that you have a '
         'class with an @CustomTag annotation for each of the following tags: '
         '${waiting.map((e) => "'${e.attributes['name']}'").join(', ')}');
   });
 }