Make VM event streams look like real dart streams.

runtime/observatory/tests/service/isolate_lifecycle_test.dart

Index: runtime/observatory/tests/service/isolate_lifecycle_test.dart
diff --git a/runtime/observatory/tests/service/isolate_lifecycle_test.dart b/runtime/observatory/tests/service/isolate_lifecycle_test.dart
index 318013706ab094fe287449d40e796c4a9840de83..ced3603a9c9d7f739e23aed69553543ec25ce9c1 100644
--- a/runtime/observatory/tests/service/isolate_lifecycle_test.dart
+++ b/runtime/observatory/tests/service/isolate_lifecycle_test.dart
@@ -54,7 +54,7 @@ var tests = [
   (VM vm) async {
     // Wait for the testee to start all of the isolates.
     if (vm.isolates.length != spawnCount + 1) {
-      await processServiceEvents(vm, (event, sub, completer) {
+      await processIsolateEvents(vm, (event, sub, completer) {
         if (event.kind == ServiceEvent.kIsolateStart) {
           if (vm.isolates.length == spawnCount + 1) {
             sub.cancel();
@@ -76,7 +76,7 @@ var tests = [
   (VM vm) async {
     // Wait for all spawned isolates to hit pause-at-exit.
     if (numPaused(vm) != spawnCount) {
-      await processServiceEvents(vm, (event, sub, completer) {
+      await processDebugEvents(vm, (event, sub, completer) {
         if (event.kind == ServiceEvent.kPauseExit) {
           if (numPaused(vm) == spawnCount) {
             sub.cancel();
@@ -92,7 +92,7 @@ var tests = [
 
   (VM vm) async {
     var resumedReceived = 0;
-    var eventsDone = processServiceEvents(vm, (event, sub, completer) {
+    var eventsDone = processIsolateEvents(vm, (event, sub, completer) {
       if (event.kind == ServiceEvent.kIsolateExit) {
         resumedReceived++;
         if (resumedReceived == resumeCount) {