We can now name the current VM using the service protocol.

runtime/vm/service_event.cc

Index: runtime/vm/service_event.cc
diff --git a/runtime/vm/service_event.cc b/runtime/vm/service_event.cc
index 42dd2022f53e4197148edebd27d1afa1538bb893..1023043f73de0df196e7bd6ad5d64c88f9d25654 100644
--- a/runtime/vm/service_event.cc
+++ b/runtime/vm/service_event.cc
@@ -91,6 +91,8 @@ ServiceEvent::ServiceEvent(const DebuggerEvent* debugger_event)
 
 const char* ServiceEvent::KindAsCString() const {
   switch (kind()) {
+    case kVMUpdate:
+      return "VMUpdate";
     case kIsolateStart:
       return "IsolateStart";
     case kIsolateRunnable:
@@ -138,6 +140,9 @@ const char* ServiceEvent::KindAsCString() const {
 
 const char* ServiceEvent::stream_id() const {
   switch (kind()) {
+    case kVMUpdate:
+      return Service::vm_stream.id();
+
     case kIsolateStart:
     case kIsolateRunnable:
     case kIsolateExit:
@@ -234,7 +239,11 @@ void ServiceEvent::PrintJSONHeader(JSONObject* jsobj) const {
   ASSERT(jsobj != NULL);
   jsobj->AddProperty("type", "Event");
   jsobj->AddProperty("kind", KindAsCString());
-  jsobj->AddProperty("isolate", isolate());
+  if (kind() == kVMUpdate) {
+    jsobj->AddPropertyVM("vm");
+  } else {
+    jsobj->AddProperty("isolate", isolate());
+  }
   ASSERT(timestamp_ != -1);
   jsobj->AddPropertyTimeMillis("timestamp", timestamp_);
 }