Initial GUI for VM service

runtime/bin/vmservice/client/packages/observatory/src/observatory/isolate_manager.dart

Index: runtime/bin/vmservice/client/packages/observatory/src/observatory/isolate_manager.dart
diff --git a/runtime/bin/vmservice/client/packages/observatory/src/observatory/isolate_manager.dart b/runtime/bin/vmservice/client/packages/observatory/src/observatory/isolate_manager.dart
new file mode 100644
index 0000000000000000000000000000000000000000..53b262cf4ab286d2cf363a8ad4eb8ba2bb19ef34
--- /dev/null
+++ b/runtime/bin/vmservice/client/packages/observatory/src/observatory/isolate_manager.dart
@@ -0,0 +1,51 @@
+// 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.
+
+part of observatory;
+
+/// Collection of isolates which are running in the VM. Updated
+class IsolateManager extends ObservableMixin {
+  ObservatoryApplication _application;
+  ObservatoryApplication get application => _application;
+
+  @observable final Map<int, Isolate> isolates =
+      toObservable(new Map<int, Isolate>());
+
+  static bool _foundIsolateInMembers(int id, List<Map> members) {
+    return members.any((E) => E['id'] == id);
+  }
+
+  void _responseInterceptor() {
+    _application.requestManager.responses.forEach((response) {
+      if (response['type'] == 'IsolateList') {
+        _updateIsolates(response['members']);
+      }
+    });
+  }
+
+  void _updateIsolates(List<Map> members) {
+    // Find dead isolates.
+    var deadIsolates = [];
+    isolates.forEach((k, v) {
+      if (!_foundIsolateInMembers(k, members)) {
+        deadIsolates.add(k);
+      }
+    });
+    // Remove them.
+    deadIsolates.forEach((k) {
+      print('Removing ${isolates[k]}');
+      isolates.remove(k);
+    });
+    // Add new isolates.
+    members.forEach((k) {
+      var id = k['id'];
+      var name = k['name'];
+      if (isolates[id] == null) {
+        var isolate = new Isolate(id, name);
+        print('Adding $isolate');
+        isolates[id] = isolate;
+      }
+    });
+  }
+}