Add support for asynchronous event notification to the observatory.

runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart

Index: runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart
diff --git a/runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart b/runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart
index b35acca1cc8bc0aef7315bc29879aec0959d547c..28a8f1d947a4df7394433b106d35bc567c04651b 100644
--- a/runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart
+++ b/runtime/bin/vmservice/client/lib/src/elements/isolate_summary.dart
@@ -37,6 +37,7 @@ class IsolateRunStateElement extends ObservatoryElement {
         // TODO(turnidge): Instead of asserting here, handle errors
         // properly.
         assert(result.serviceType == 'Success');
+        app.removePauseEvents(isolate);
         return isolate.reload();
       });
   }