Create a unique name for each failure step.

dart/tools/testing/dart/test_progress.dart

 // Copyright (c) 2012, 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_progress");
 
 #import("dart:io");
 #import("dart:builtin");
 #import("test_runner.dart");
 #import("test_suite.dart");
@@ skipping 342 matching lines @@
       status = 'fail';
     }
     var percent = ((_completedTests() / _foundTests) * 100).toInt().toString();
     print('Done ${test.configurationString} ${test.displayName}: $status');
     print('@@@STEP_CLEAR@@@');
     print('@@@STEP_TEXT@ $percent% +$_passedTests -$_failedTests @@@');
   }
 
   void _printFailureSummary() {
     if (!_failureSummary.isEmpty()) {
+      // We need to create a unique name for each step, otherwise, the
+      // build bot will show the same failure when several steps
+      // fail. We don't know the name of the current step as it is
+      // printed by the program invoking this.
+      // TODO(ahe): Pass in the step name as an option, and let
+      // test.py take care of printing the steps.
+      var name = 'failures ($_startTime)';
       print('@@@STEP_FAILURE@@@');
-      print('@@@BUILD_STEP failures@@@');
+      print('@@@BUILD_STEP $name@@@');
     }
     super._printFailureSummary();
   }
 }