Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/service_common.dart

Index: runtime/observatory/lib/service_common.dart
diff --git a/runtime/observatory/lib/service_common.dart b/runtime/observatory/lib/service_common.dart
index ba553493c34fbc114cf7e4ad8e4495d7d0eca4e0..73d1288ce29133b120ac7bbb0acce0023ce1638a 100644
--- a/runtime/observatory/lib/service_common.dart
+++ b/runtime/observatory/lib/service_common.dart
@@ -8,6 +8,8 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:typed_data';
 
+import 'package:observatory/models.dart' as M;
+
 import 'package:logging/logging.dart';
 import 'package:observatory/service.dart';
 
@@ -15,7 +17,7 @@ import 'package:observatory/service.dart';
 export 'package:observatory/service.dart';
 
 /// Description of a VM target.
-class WebSocketVMTarget {
+class WebSocketVMTarget implements M.Target {
   // Last time this VM has been connected to.
   int lastConnectionTime = 0;
   bool get hasEverConnected => lastConnectionTime > 0;