VM Service isolate listing

runtime/bin/vmservice/running_isolate.dart

Index: runtime/bin/vmservice/running_isolate.dart
diff --git a/runtime/bin/vmservice/running_isolate.dart b/runtime/bin/vmservice/running_isolate.dart
new file mode 100644
index 0000000000000000000000000000000000000000..540c5ea36ad4e58ebaa85df749b2aadabb2825da
--- /dev/null
+++ b/runtime/bin/vmservice/running_isolate.dart
@@ -0,0 +1,48 @@
+// 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 vmservice;
+
+class RunningIsolate implements ServiceRequestRouter {
+  final SendPort sendPort;
+  String id = 'Unknown';
+
+  RunningIsolate(this.sendPort);
+
+  Future sendMessage(String request) {
+    final completer = new Completer.sync();
+    final receivePort = new ReceivePort();
+    sendServiceMessage(sendPort, receivePort, request);
+    receivePort.receive((value, ignoreReplyTo) {
+      receivePort.close();
+      if (value is Exception) {
+        completer.completeError(value);
+      } else {
+        completer.complete(value);
+      }
+    });
+    return completer.future;
+  }
+
+  bool route(ServiceRequest request) {
+    // Do nothing for now.
+    return false;
+  }
+
+  void sendIdRequest() {
+    var request = JSON.stringify({'p': ['id'], 'k': [], 'v': []});
+    sendMessage(request).then(_handleIdResponse);
+  }
+
+  void _handleIdResponse(responseString) {
+    var response;
+    try {
+      response = JSON.parse(responseString);
+    } catch (e) {
+      id = 'Error retrieving isolate id.';
+      return;
+    }
+    id = response['id'];
+  }
+}