Add the ability to change the working directory

utils/testrunner/utils.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.
 
 part of testrunner;
 
 /** Create a file [fileName] and populate it with [contents]. */
 void writeFile(String fileName, String contents) {
   var file = new File(fileName);
   file.writeAsStringSync(contents);
@@ skipping 18 matching lines @@
 
 /**
  * Given a file path [path], make it absolute if it is relative,
  * and return the result.
  */
 String makePathAbsolute(String path) {
   var p = new Path(path).canonicalize();
   if (p.isAbsolute) {
     return p.toNativePath();
   } else {
-    var cwd = new Path((new Directory.current()).path);
+    var cwd = new Path(Directory.current.path);
     return cwd.join(p).toNativePath();
   }
 }
 
 /**
  * Create the list of all the files in a set of directories
  * ([dirs]) whose names match [filePat]. If [recurse] is true
  * look at subdirectories too. An optional [excludePat] can be supplied
  * and files or directories that match that will be excluded.
  * [includeSymLinks] controls whether or not to include files that
@@ skipping 59 matching lines @@
     options = new ProcessOptions();
     options.workingDirectory = workingDir;
   }
   return Process.run(command, args, options)
       .then((result) => result.exitCode)
       .catchError((e) {
         print("$command ${args.join(' ')}: ${e.toString()}");
       });
 }