Added find-shard to bot.dart.

tools/gardening/bin/find_timeouts.dart

 // Copyright (c) 2017, 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.
 
 /// Scans past dart2js-windows test steps for timeouts and reports the
 /// frequency of each test that has timed out.
 
 import 'dart:async';
 import 'dart:io';
 import 'package:args/args.dart';
 import 'package:gardening/src/buildbot_data.dart';
 import 'package:gardening/src/buildbot_loading.dart';
 import 'package:gardening/src/buildbot_structures.dart';
 import 'package:gardening/src/client.dart';
 import 'package:gardening/src/logdog.dart' as logdog;
 import 'package:gardening/src/util.dart';
 
+// TODO(johnniwinther): Adjustments needed: this script may run with
+// no output for a long time. Hence not yet run by bot.dart.
 main(List<String> args) async {
   ArgParser argParser = createArgParser();
   argParser.addOption('start',
       defaultsTo: '-2',
       help: "Start pulling from the specified <build-number>.\n"
           "Use negative numbers for the most recent builds;\n"
           "for instance -2 for the second-to-last build.'");
   ArgResults argResults = argParser.parse(args);
   processArgResults(argResults);
 
@@ skipping 103 matching lines @@
 }
 
 class Timeout {
   final BuildSubgroup subgroup;
   final int buildNumber;
   final BuildUri buildUri;
   final TestFailure timeout;
 
   Timeout(this.subgroup, this.buildNumber, this.buildUri, this.timeout);
 }