Build Observatory as part of runtime

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/app.dart';
 import 'package:observatory/service.dart';
@@ skipping 130 matching lines @@
 
   Future resume(_) {
     return isolate.get("resume").then((result) {
         // TODO(turnidge): Instead of asserting here, handle errors
         // properly.
         assert(result.type == 'Success');
         return isolate.reload();
       });
   }
 }