Initial isolate reload support

runtime/observatory/lib/src/elements/isolate_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 isolate_view_element;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
@@ skipping 15 matching lines @@
     }
     isolate.rootLibrary.load().then((lib) => rootLibrary = lib);
   }
 
   Future refresh() async {
     await isolate.reload();
     if (isolate.topFrame != null) {
       await isolate.topFrame.function.load();
     }
   }
+
+  Future reloadSources() {
+    return isolate.reloadSources();
+  }
 }