Add support for asynchronous event notification to the observatory.

runtime/bin/vmservice/client/lib/src/elements/isolate_summary.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_summary_element;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
 import 'package:observatory/service.dart';
@@ skipping 19 matching lines @@
         assert(result.serviceType == 'Success');
         return isolate.reload();
       });
   }
 
   Future resume(_) {
     return isolate.get("debug/resume").then((result) {
         // TODO(turnidge): Instead of asserting here, handle errors
         // properly.
         assert(result.serviceType == 'Success');
+        app.removePauseEvents(isolate);
         return isolate.reload();
       });
   }
 }
 
 @CustomTag('isolate-location')
 class IsolateLocationElement extends ObservatoryElement {
   IsolateLocationElement.created() : super.created();
 
   @published Isolate isolate;
@@ skipping 53 matching lines @@
     chart.update(counters);
     var element = shadowRoot.querySelector('#counterPieChart');
     if (element != null) {
       chart.draw(element);
     }
   }
 }