Client-side support for stacktrace VM status.

runtime/bin/vmstats/vmstats.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 dart.vmstats;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:json' as JSON;
 
 part 'bargraph.dart';
 part 'isolate_list.dart';
 part 'models.dart';
 
 BarGraph _graph;
 IsolateList _isolateList;
 DivElement _statusText;
 IsolateListModel _isolates;
 Timer _updater;
 
 final int _POLL_INTERVAL = const Duration(seconds: 1);
+final String CYAN = '#00EE76';
+final String GREEN = '#97FFFF';
 
 void main() {
   DivElement dashBoard = query('#dashboard');
   CanvasElement canvas = query('#graph');
-  var elements = [ new Element("Old Space", "#97FFFF"),
-                   new Element("New Space", "#00EE76")];
+  var elements = [ new Element("Old Space", GREEN),
+                   new Element("New Space", CYAN)];
   _graph = new BarGraph(canvas, elements);
-  UListElement isolateListElement = query('#isolateList');
-  _isolateList = new IsolateList(isolateListElement);
+  _isolateList = new IsolateList(query('#isolateList'));
   _statusText = query('#statusText');
 
   _isolates = new IsolateListModel();
   _isolates.addListener(onUpdateStatus, onRequestFailed);
   _isolates.update();
   _updater = new Timer.periodic(_POLL_INTERVAL, (timer) => _isolates.update());
 }
 
 void onUpdateStatus(IsolateListModel model) {
   int oldSpace = 0;
   int newSpace = 0;
   model.forEach((Isolate element) {
     oldSpace += element.oldSpace.used;
     newSpace += element.newSpace.used;
   });
   _graph.addSample([oldSpace, newSpace]);
   _isolateList.updateList(model);
   showStatus('Running ...');
 }
 
 void onRequestFailed() {
   _updater.cancel();
   _isolates.removeListener(onUpdateStatus);
   showStatus('Server closed');
 }
 
 void showStatus(status) {
   _statusText.text = status;
 }