Increase shutdown timeout to work around slow analysis server startup time.

pkg/analysis_server/test/integration/integration_tests.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 test.integration.analysis;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analysis_server/src/constants.dart';
 import 'package:path/path.dart';
 import 'package:unittest/unittest.dart';
 
 /**
  * Base class for analysis server integration tests.
  */
 abstract class AbstractAnalysisServerIntegrationTest {
   /**
    * Amount of time to give the server to respond to a shutdown request before
    * forcibly terminating it.
+   *
+   * TODO(paulberry): the extra-long timeout (20s) is because sometimes the
+   * buildbots are slow to spawn a new analysis server process.  It would be
+   * better to wait for the initial "server.connected" message with a long
+   * timeout, and keep this timeout short.
+   *
    */
-  static const Duration SHUTDOWN_TIMEOUT = const Duration(seconds: 5);
+  static const Duration SHUTDOWN_TIMEOUT = const Duration(seconds: 20);
 
   /**
    * Connection to the analysis server.
    */
   Server server;
 
   /**
    * Temporary directory in which source files can be stored.
    */
   Directory sourceDirectory;
@@ skipping 676 matching lines @@
   void _recordStdio(String line) {
     double elapsedTime = _time.elapsedTicks.toDouble() /
         _time.frequency.toDouble();
     line = "$elapsedTime: $line";
     if (_debuggingStdio) {
       print(line);
     }
     _recordedStdio.add(line);
   }
 }