Add test to compare-failures

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';
@@ skipping 85 matching lines @@
       buildNumberIndex = -buildNumberOffset - 1;
     } else {
       buildNumberIndex = buildNumbers.firstWhere((n) => n <= buildNumberOffset,
           orElse: () => buildNumbers.length);
     }
     for (int i = 0; i < buildNumberCount; i++) {
       if (buildNumberIndex + i < buildNumbers.length) {
         int buildNumber = buildNumbers[buildNumberIndex + i];
         for (BuildUri buildUri
             in subgroup.createShardUris(shardName, buildNumber)) {
-          BuildResult result = await readLogDogResult(buildUri);
+          BuildResult result = await readBuildResultFromLogDog(buildUri);
           for (TestFailure timeout in result.timeouts) {
             timeouts.putIfAbsent(timeout.id.testName, () => <Timeout>[]).add(
                 new Timeout(subgroup, result.buildNumber, buildUri, timeout));
           }
           buildUri = buildUri.prev();
         }
       }
     }
   }
 }
@@ skipping 16 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);
 }