Added support for "bin-ified" vmstats web app source files

runtime/bin/vmstats/vmstats.dart

+library vmstats;
+
+import 'dart:async';
+import 'dart:html';
+import 'dart:json' as JSON;
+
+part 'bargraph.dart';
+part 'isolate_list.dart';
+part 'models.dart';
+part 'server_access.dart';
+
+BarGraph _graph;
+IsolateList _isolateList;
+DivElement _statusText;
+IsolateListModel _isolates;
+Timer _updater;
+
+final int _POLL_INTERVAL = 1000;
+
+void main() {
+  DivElement dashBoard = query('#dashboard');
+  CanvasElement canvas = query('#graph');
+  var elements = [ new Element("Old Space", "#97FFFF"),
+                   new Element("New Space", "#00EE76")];
+  _graph = new BarGraph(canvas, elements);
+  UListElement isolateListElement = query('#isolateList');
+  _isolateList = new IsolateList(isolateListElement);
+  _statusText = query('#statusText');
+
+  _isolates = new IsolateListModel();
+  _isolates.addListener(onUpdateStatus, onRequestFailed);
+  _isolates.update();
+  _updater = new Timer.repeating(_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(int errorCode) {
+  _updater.cancel();
+  _isolates.removeListener(onUpdateStatus);
+  if (errorCode > 0) {
+    showStatus('Connection failure: $errorCode');
+  } else {
+    showStatus('Server closed');
+  }
+}
+
+void showStatus(status) {
+  _statusText.text = status;
+}