Add the streamListen and streamCancel rpcs to the vm service.

runtime/observatory/lib/src/app/application.dart

Index: runtime/observatory/lib/src/app/application.dart
diff --git a/runtime/observatory/lib/src/app/application.dart b/runtime/observatory/lib/src/app/application.dart
index ef74096fb64be8e836795d833d03ae55a61d0de0..14c6d29e3bb637c10c361b10a79b41b21a214c47 100644
--- a/runtime/observatory/lib/src/app/application.dart
+++ b/runtime/observatory/lib/src/app/application.dart
@@ -53,7 +53,8 @@ class ObservatoryApplication extends Observable {
                 new ServiceEvent.connectionClosed(reason)));
       });
 
-      vm.events.stream.listen(_onEvent);
+      vm.isolateEvents.listen(_onEvent);
+      vm.debugEvents.listen(_onEvent);
     }
     _vm = vm;
   }
@@ -88,11 +89,9 @@ class ObservatoryApplication extends Observable {
     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;
 
@@ -116,7 +115,7 @@ class ObservatoryApplication extends Observable {
 
       default:
         // Ignore unrecognized events.
-        Logger.root.severe('Unrecognized event: $event');
+        Logger.root.severe('Ignoring unexpected event: $event');
         break;
     }
   }