anchor.diff:  
   import 'dart:async';
   import 'dart:convert' show JSON;
  +
  +import 'platform_info.dart';
   
   /**
    * Stores global developer flags.
  
positive.code: 
    static bool get polymerDesigner =>
        _flags['enable-polymer-designer'] == true;
  
    /**
     * Add new flags to the set, possibly overwriting the existing values.
  
negative.code:     "bower-override-dependencies": {
      },
      "bower-use-git-clone": false,
      "package-files-are-editable": false,
      "enable-new-usb-api": true
    };
  
    /**
  