Add the streamListen and streamCancel rpcs to the vm service.

runtime/observatory/tests/service/debugger_inspect_test.dart

Index: runtime/observatory/tests/service/debugger_inspect_test.dart
diff --git a/runtime/observatory/tests/service/debugger_inspect_test.dart b/runtime/observatory/tests/service/debugger_inspect_test.dart
index fdbc4c7fa0d2a34a384e1a10ecab08c8cc5917e1..70f0df99a07ecb6522ff412bc8bb9160f9661208 100644
--- a/runtime/observatory/tests/service/debugger_inspect_test.dart
+++ b/runtime/observatory/tests/service/debugger_inspect_test.dart
@@ -23,7 +23,7 @@ var tests = [
 (Isolate isolate) async {
   Completer completer = new Completer();
   var subscription;
-  subscription = isolate.vm.events.stream.listen((ServiceEvent event) {
+  subscription = isolate.vm.debugEvents.listen((ServiceEvent event) {
     print(event);
     if (event.eventType == ServiceEvent.kInspect) {
       expect((event.inspectee as Instance).clazz.name, equals('Point'));