Refactor VM service IDs

runtime/bin/vmservice/client/lib/src/observatory_elements/script_ref.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.
+
+library script_ref_element;
+
+import 'package:polymer/polymer.dart';
+import 'observatory_element.dart';
+
+@CustomTag('script-ref')
+class ScriptRefElement extends ObservatoryElement {
+  @published Map ref;
+  // TODO(johnmccutchan): Remove scriptURL once Frame objects provide a proper
+  // script reference.
+  @published String scriptURL = '';
+  ScriptRefElement.created() : super.created();
+
+  void refChanged(oldValue) {
+    notifyPropertyChange(#url, "", url);
+    notifyPropertyChange(#name, [], name);
+  }
+
+  void scriptURLChanged(oldValue) {
+    notifyPropertyChange(#url, "", url);
+    notifyPropertyChange(#name, [], name);
+  }
+
+  String get url {
+    if (app != null && ref != null) {
+      return app.locationManager.currentIsolateRelativeLink(ref['id']);
+    } else if (app != null) {
+      return app.locationManager.currentIsolateScriptLink(scriptURL);
+    }
+    return '';
+  }
+
+  String get name {
+    return ref != null ? ref['name'] : scriptURL;
+  }
+}