Add --time option to dart test scripts.

tools/testing/dart/test_runner.dart

 // Copyright (c) 2011, 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_runner");
 
 #import("status_file_parser.dart");
 #import("test_progress.dart");
 #import("test_suite.dart");
 
@@ skipping 313 matching lines @@
   bool _verbose;
   Function _enqueueMoreWork;
   Queue<TestCase> _tests;
   ProgressIndicator _progress;
   // For dartc batch processing we keep a list of batch processes.
   List<DartcBatchRunnerProcess> _batchProcesses;
 
   ProcessQueue(int this._maxProcesses,
                String progress,
                bool this._verbose,
-               Date start_time,
+               Date startTime,
+               bool printTiming,
                Function this._enqueueMoreWork)
       : _tests = new Queue<TestCase>(),
-        _progress = new ProgressIndicator.fromName(progress, start_time),
+        _progress = new ProgressIndicator.fromName(progress,
+                                                   startTime,
+                                                   printTiming),
         _batchProcesses = new List<DartcBatchRunnerProcess>() {
     if (!_enqueueMoreWork(this)) _progress.allDone();
   }
 
   void addTestSuite(TestSuite testSuite) {
     _activeTestListers++;
     testSuite.forEachTest(_runTest, _testListerDone);
   }
 
   void _testListerDone() {
@@ skipping 56 matching lines @@
       if (test.executablePath.contains('compiler')) {
         _ensureDartcBatchRunnersStarted(test.executablePath);
         _getDartcBatchRunnerProcess().startTest(test);
       } else {
         new RunningProcess(test).start();
       }
       _numProcesses++;
     }
   }
 }