Exit stdio-based analysis server when stdin closed.

pkg/analysis_server/lib/driver.dart

 // 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 driver;
 
 import 'dart:io';
 
 import 'package:analysis_server/http_server.dart';
 import 'package:analysis_server/src/socket_server.dart';
@@ skipping 60 matching lines @@
     try {
       int port = int.parse(results[PORT_OPTION]);
       httpServer.serveHttp(port);
     } on FormatException {
       print('Invalid port number: ${results[PORT_OPTION]}');
       print('');
       _printUsage(parser);
       exitCode = 1;
       return;
     }
-    stdioServer.serveStdio();
+    stdioServer.serveStdio().then((_) {
+      httpServer.close();
+    });
   }
 
   /**
    * Print information about how to use the server.
    */
   void _printUsage(ArgParser parser) {
     print('Usage: $BINARY_NAME [flags]');
     print('');
     print('Supported flags are:');
     print(parser.getUsage());
   }
 }