Reland support for firefox jsshell.

tools/testing/dart/test_runner.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.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 615 matching lines @@
         // This RunningProcess object is done, and hands over control to
         // BatchRunner.startTest(), which handles reporting, etc.
         timeoutTimer.cancel();
         processQueue._getBatchRunner(testCase).startTest(testCase);
       } else {
         runCommand(testCase.commands[currentStep++], stepExitHandler);
       }
     }
   }
 
-  VoidFunction makeReadHandler(StringInputStream source, List<String> destination) {
+  VoidFunction makeReadHandler(StringInputStream source,
+                               List<String> destination) {
     void handler () {
       if (source.closed) return;  // TODO(whesse): Remove when bug is fixed.
       var line = source.readLine();
       while (null != line) {
         destination.add(line);
         line = source.readLine();
       }
     }
     return handler;
   }
 
   void start() {
     Expect.isFalse(testCase.expectedOutcomes.contains(SKIP));
     stdout = new List<String>();
     stderr = new List<String>();
     currentStep = 0;
     startTime = new Date.now();
     runCommand(testCase.commands[currentStep++], stepExitHandler);
   }
 
-  void runCommand(Command command,
-                  void exitHandler(int exitCode)) {
+  void runCommand(Command command, void exitHandler(int exitCode)) {
     process = Process.start(command.executable, command.arguments);
     process.onExit = exitHandler;
     process.onError = (e) {
       print("Error starting process:");
       print("  Command: $command");
       print("  Error: $e");
       testComplete(-1, false);
     };
     InputStream stdoutStream = process.stdout;
     InputStream stderrStream = process.stderr;
@@ skipping 576 matching lines @@
         // the developer doesn't waste his or her time trying to fix a bunch of
         // tests that appear to be broken but were actually just flakes that
         // didn't get retried because there had already been one failure.
         bool allowRetry = _MAX_FAILED_NO_RETRY > _progress.numFailedTests;
         new RunningProcess(test, allowRetry, this).start();
       }
       _numProcesses++;
     }
   }
 }