Add in-process http server to the dart test scripts.

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 202 matching lines @@
   void start(TestCase test) { }
   void done(TestCase test) { }
   void _printStartProgress(TestCase test) { }
   void _printDoneProgress(TestCase test) { }
   void allTestsKnown() { }
   void allDone() {
     exit(0);
   }
 }
 
-class CompactIndicator extends ProgressIndicator {
+abstract class CompactIndicator extends ProgressIndicator {
   CompactIndicator(Date startTime, bool printTiming)
       : super(startTime, printTiming);
 
   void allDone() {
     stdout.write('\n'.charCodes());
     _printFailureSummary();
     _printTimingInformation();
     if (_failedTests > 0) {
       // We may have printed many failure logs, so reprint the summary data.
       _printProgress();
       print('');
     }
     stdout.close();
     exit(_failedTests > 0 ? 1 : 0);
   }
 
   void allTestsKnown() {
     if (!_allTestsKnown && SummaryReport.total > 0) {
       // Clear progress indicator before printing summary report.
       stdout.write(
           '\r                                               \r'.charCodes());
       SummaryReport.printReport();
     }
     _allTestsKnown = true;
   }
 
   void _printStartProgress(TestCase test) => _printProgress();
   void _printDoneProgress(TestCase test) => _printProgress();
 
-  abstract void _printProgress();
+  void _printProgress();
 }
 
 
 class CompactProgressIndicator extends CompactIndicator {
   CompactProgressIndicator(Date startTime, bool printTiming)
       : super(startTime, printTiming);
 
   void _printProgress() {
     var percent = ((_completedTests() / _foundTests) * 100).toInt().toString();
     var progressPadded = _pad(_allTestsKnown ? percent : '--', 3);
@@ skipping 136 matching lines @@
       print('');
       print('$key:');
       lines.sort((a, b) => a.compareTo(b));
       for (String line in lines) {
         print('  $line');
       }
     });
     _printStatus();
   }
 }