Very simple version of Isolates.

runtime/bin/vmservice/running_isolate.dart

Index: runtime/bin/vmservice/running_isolate.dart
diff --git a/runtime/bin/vmservice/running_isolate.dart b/runtime/bin/vmservice/running_isolate.dart
index 2d4af13ae97c8b7cd1c16398af2ecf051447251a..13b358a1becc614515bd205c21179a4eb951fde3 100644
--- a/runtime/bin/vmservice/running_isolate.dart
+++ b/runtime/bin/vmservice/running_isolate.dart
@@ -12,16 +12,16 @@ class RunningIsolate implements ServiceRequestRouter {
 
   Future sendMessage(List request) {
     final completer = new Completer.sync();
-    final receivePort = new ReceivePort();
+    final receivePort = new RawReceivePort();
     sendServiceMessage(sendPort, receivePort, request);
-    receivePort.receive((value, ignoreReplyTo) {
+    receivePort.handler = (value) {
       receivePort.close();
       if (value is Exception) {
         completer.completeError(value);
       } else {
         completer.complete(value);
       }
-    });
+    };
     return completer.future;
   }