Add tools/ddbg_service.

tools/ddbg_service/lib/commando.dart

Index: tools/ddbg_service/lib/commando.dart
diff --git a/tools/ddbg/lib/commando.dart b/tools/ddbg_service/lib/commando.dart
similarity index 97%
copy from tools/ddbg/lib/commando.dart
copy to tools/ddbg_service/lib/commando.dart
index f3ff3ea5e888ad76006a5d047364375cf35f2113..5b46b6be1bc86627f9199d58eab338e5e031dc72 100644
--- a/tools/ddbg/lib/commando.dart
+++ b/tools/ddbg_service/lib/commando.dart
@@ -1,13 +1,15 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2014, 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 commando;
+
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 import 'dart:math';
 
-import 'terminfo.dart';
+import 'package:ddbg/terminfo.dart';
 
 typedef List<String> CommandCompleter(List<String> commandParts);
 
@@ -687,15 +689,23 @@ List<String> _myCompleter(List<String> commandTokens) {
 
 int _helpCount = 0;
 Commando cmdo;
+var cmdoSubscription;
 
 
 void _handleCommand(String rawCommand) {
   String command = rawCommand.trim();
   cmdo.hide();
   if (command == 'quit') {
-    cmdo.close().then((_) {
-        print('Exiting');
-      });
+    var future = cmdoSubscription.cancel();
+    if (future != null) {
+      future.then((_) {
+          print('Exiting');
+          exit(0);
+        });
+    } else {
+      print('Exiting');
+      exit(0);
+    }
   } else if (command == 'help') {
     switch (_helpCount) {
       case 0:
@@ -727,5 +737,5 @@ void _handleCommand(String rawCommand) {
 void main() {
   print('[Commando demo]');
   cmdo = new Commando(completer:_myCompleter);
-  cmdo.commands.listen(_handleCommand);
+  cmdoSubscription = cmdo.commands.listen(_handleCommand);
 }