Add dart:io view to the observatory.

runtime/bin/vmservice/client/lib/src/elements/json_view.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.
 
 library json_view_element;
 
 import 'package:polymer/polymer.dart';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 
@@ skipping 56 matching lines @@
         _writeIndent(depth);
         _buffer.write(v);
         _buffer.write('\n');
       }
     }
     _seen.remove(list);
   }
 
   void _writeIndent(int depth) {
     const tab = '  ';  // 2 spaces.
-    _buffer.write(depth * tab);
+    _buffer.write(tab * depth);
   }
 
   final _buffer = new StringBuffer();
   final _seen = new Set();
 }
 
 
 @CustomTag('json-view')
 class JsonViewElement extends ObservatoryElement {
   @published ServiceMap map;
   @observable String mapAsString;
   JsonViewElement.created() : super.created();
 
   void mapChanged(oldValue) {
     var jpp = new JsonPrettyPrinter();
     mapAsString = jpp.prettyPrint(map);
   }
 }