Add crash dumps to service protocol and Observatory

runtime/vm/service/running_isolate.dart

Index: runtime/vm/service/running_isolate.dart
diff --git a/runtime/vm/service/running_isolate.dart b/runtime/vm/service/running_isolate.dart
index 3dd4839675cd57b80bef44181849e9cc27ed47c7..48eec0d95c503cd408bbc0271253620a56de8b70 100644
--- a/runtime/vm/service/running_isolate.dart
+++ b/runtime/vm/service/running_isolate.dart
@@ -11,6 +11,8 @@ class RunningIsolate implements MessageRouter {
 
   RunningIsolate(this.portId, this.sendPort, this.name);
 
+  String get serviceId => 'isolates/$portId';
+
   Future<String> route(Message message) {
     // Send message to isolate.
     return message.send(sendPort);