Allow Observatory debugger to switch isolates.

runtime/observatory/lib/src/app/application.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.
 
 part of app;
 
 /// The observatory application. Instances of this are created and owned
 /// by the observatory_application custom element.
 class ObservatoryApplication extends Observable {
   static ObservatoryApplication app;
@@ skipping 49 matching lines @@
 
     notifications.removeWhere((oldEvent) {
         return (oldEvent.isolate == isolate &&
                 isPauseEvent(oldEvent));
       });
   }
 
   void _onEvent(ServiceEvent event) {
     switch(event.eventType) {
       case ServiceEvent.kIsolateStart:
+      case ServiceEvent.kIsolateUpdate:
       case ServiceEvent.kGraph:
       case ServiceEvent.kBreakpointAdded:
       case ServiceEvent.kBreakpointResolved:
       case ServiceEvent.kBreakpointRemoved:
       case ServiceEvent.kGC:
         // Ignore for now.
         break;
 
       case ServiceEvent.kIsolateExit:
       case ServiceEvent.kResume:
@@ skipping 135 matching lines @@
 
   _vmDisconnected(VM vm) {
     if (this.vm != vm) {
       // This disconnect event occured *after* a new VM was installed.
       return;
     }
     this.vm = null;
     notifications.add(new ServiceEvent.vmDisconencted());
   }
 }