Add breakpoints and single-stepping to Observatory.

runtime/bin/vmservice/client/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;
   final _pageRegistry = new List<Page>();
   @observable Page currentPage;
   @observable final LocationManager locationManager;
   VM _vm;
   VM get vm => _vm;
   set vm(VM vm) {
     if (_vm == vm) {
       // Do nothing.
       return;
     }
     if (_vm != null) {
       // Disconnect from current VM.
+      notifications.clear();
       _vm.disconnect();
     }
     if (vm != null) {
       Logger.root.info('Registering new VM callbacks');
       vm.onConnect.then(_vmConnected);
       vm.onDisconnect.then(_vmDisconnected);
       vm.errors.stream.listen(_onError);
+      vm.events.stream.listen(_onEvent);
       vm.exceptions.stream.listen(_onException);
     }
     _vm = vm;
   }
   final TargetManager targets;
   @observable Isolate isolate;
   @reflectable final ObservatoryApplicationElement rootElement;
 
   @reflectable ServiceObject lastErrorOrException;
   @observable ObservableList<ServiceEvent> notifications =
@@ skipping 12 matching lines @@
               event.eventType == 'BreakpointReached' ||
               event.eventType == 'ExceptionThrown');
     }
 
     notifications.removeWhere((oldEvent) {
         return (oldEvent.isolate == isolate &&
                 isPauseEvent(oldEvent));
       });
   }
 
-  void _handleEvent(ServiceEvent event) {
+  void _onEvent(ServiceEvent event) {
     switch(event.eventType) {
       case 'IsolateCreated':
         // vm.reload();
         break;
 
       case 'IsolateShutdown':
         // TODO(turnidge): Should we show the user isolate shutdown events?
         // What if there are hundreds of them?  Coalesce multiple
         // shutdown events into one notification?
         removePauseEvents(event.isolate);
         // vm.reload();
         break;
         
       case 'BreakpointResolved':
-        // Do nothing.
+        event.isolate.reloadBreakpoints();
         break;
 
       case 'BreakpointReached':
       case 'IsolateInterrupted':
       case 'ExceptionThrown':
         removePauseEvents(event.isolate);
         notifications.add(event);
         break;
 
       default:
@@ skipping 93 matching lines @@
 
   _vmDisconnected(VM vm) {
     if (this.vm != vm) {
       // This disconnect event occured *after* a new VM was installed.
       return;
     }
     this.vm = null;
     locationManager.go(locationManager.makeLink('/vm-connect/'));
   }
 }