Don't retry browser tests if the bot is pretty red. Also, retry properly all

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("test_runner.dart");
 #import("test_suite.dart");
 
@@ skipping 154 matching lines @@
       print('=== All tests succeeded');
       print('===\n');
     } else {
       var pluralSuffix = _failedTests != 1 ? 's' : '';
       print('\n===');
       print('=== ${_failedTests} test$pluralSuffix failed');
       print('===\n');
     }
   }
 
+  int get numFailedTests() => _failedTests;
+
   int _completedTests() => _passedTests + _failedTests;
 
   int _foundTests = 0;
   int _passedTests = 0;
   int _failedTests = 0;
   bool _allTestsKnown = false;
   Date _startTime;
   bool _printTiming;
   List<TestCase> _tests;
   List<String> _failureSummary;
@@ skipping 156 matching lines @@
     var status = 'pass';
     if (test.output.unexpectedOutput) {
       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 @@@');
   }
 }