Centralized event streams

runtime/observatory/lib/src/elements/script_ref_wrapper.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:html';
 import 'dart:async';
 
 import 'package:observatory/app.dart';
 import 'package:observatory/service_html.dart' show Script;
 import 'package:observatory/src/elements/script_ref.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/shims/binding.dart';
 
 @bindable
 class ScriptRefElementWrapper extends HtmlElement {
   static const binder = const Binder<ScriptRefElementWrapper>(const {
       'ref': #ref
     });
 
   static const tag = const Tag<ScriptRefElementWrapper>('script-ref');
 
   Script _script;
+
   Script get ref => _script;
-  set ref(Script script) { _script = script; render(); }
+
+  set ref(Script value) {
+    _script = value;
+    render();
+  }
 
   ScriptRefElementWrapper.created() : super.created() {
     binder.registerCallback(this);
     createShadowRoot();
     render();
   }
 
   @override
   void attached() {
     super.attached();
     render();
   }
 
   Future render() async {
     shadowRoot.children = [];
-    if (_script == null) return;
+    if (_script == null) {
+      return;
+    }
 
     shadowRoot.children = [
       new StyleElement()
         ..text = '''
         script-ref-wrapped > a[href]:hover {
             text-decoration: underline;
         }
         script-ref-wrapped > a[href] {
             color: #0489c3;
             text-decoration: none;
         }''',
       new ScriptRefElement(_script.isolate, _script,
                                  queue: ObservatoryApplication.app.queue)
     ];
   }
 }