Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/repositories/objects/isolate.dart

+// Copyright (c) 2016, 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
+
+part of repositories;
+
+abstract class IsolateRef {
+  String get id;
+  int get number;
+  String get name;
+}
+
+abstract class Isolate extends IsolateRef {
+  DateTime get startTime;
+  bool get runnable;
+}
+
+class IsolateEvent {
+  final IsolateRef isolate;
+  IsolateEvent(this.isolate);
+}
+
+class IsolateStartEvent extends IsolateEvent {
+  IsolateStartEvent(IsolateRef isolate) : super(isolate);
+}
+
+class IsolateRunnableEvent extends IsolateEvent {
+  IsolateRunnableEvent(IsolateRef isolate) : super(isolate);
+}
+
+class IsolateExitEvent extends IsolateEvent {
+  IsolateExitEvent(IsolateRef isolate) : super(isolate);
+}
+
+class IsolateUpdateEvent extends IsolateEvent {
+  IsolateUpdateEvent(IsolateRef isolate) : super(isolate);
+}
+
+class ServiceExtensionAdded extends IsolateEvent {
+  ServiceExtensionAdded(IsolateRef isolate) : super(isolate);
+}