Make VM event streams look like real dart streams.

runtime/observatory/tests/service/isolate_lifecycle_test.dart

 // Copyright (c) 2015, 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.
 // VMOptions=--compile-all --error_on_bad_type --error_on_bad_override
 
 import 'dart:async';
 import 'dart:isolate' as I;
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 36 matching lines @@
       running++;
     }
   }
   return running;
 }
 
 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();
             completer.complete(null);
           }
         }
       });
     }
     expect(vm.isolates.length, spawnCount + 1);
   },
 
   (VM vm) async {
     // Load each isolate.
     for (var isolate in vm.isolates) {
       await isolate.load();
     }
   },
 
   (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();
             completer.complete(null);
           }
         }
       });
     }
     expect(numPaused(vm), spawnCount);
     expect(numRunning(vm), 1);
   },
 
 
   (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) {
           sub.cancel();
           completer.complete(null);
         }
       }
     });
     var resumesIssued = 0;
     var isolateList = vm.isolates.toList();
@@ skipping 15 matching lines @@
   (VM vm) async {
     expect(numPaused(vm), spawnCount - resumeCount);
     expect(numRunning(vm), 1);
   },
 ];
 
 main(args) async => runVMTests(args, tests,
                                testeeBefore: before,
                                testeeConcurrent: during,
                                pause_on_exit: true);