Add support for client/dartc compilation only tests.

runtime/bin/directory.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.
 
 interface Directory factory _Directory {
   /**
    * Creates a directory object. The path is either a full path or
    * relative to the directory in which the Dart VM was
    * started.
    */
@@ skipping 17 matching lines @@
    * path is the empty string, a default system temp directory and name
    * are used for the template.
    * The path is modified to be the path of the new directory.
    * After the new directory is created, and the path modified, the callback
    * createTempHandler will be called.  The error handler is called if
    * the temporary directory cannot be created.
    */
   void createTemp();
 
   /**
+   * Synchronously creates a temporary directory with a name based on the current path.
+   * This name and path is used as a template, and additional characters are
+   * appended to it by the call to make a unique directory name.  If the
+   * path is the empty string, a default system temp directory and name
+   * are used for the template.
+   * The path is modified to be the path of the new directory.
+   */
+  void createTempSync();
+
+  /**
    * Deletes the directory with this name. Throws an exception
    * if the directory is not empty or if deletion failed.
    */
   void deleteSync();
 
   /**
    * List the sub-directories and files of this
    * [Directory]. Optionally recurse into sub-directories. For each
    * file and directory, the file or directory handler is called. When
    * all directories have been listed the done handler is called. If
@@ skipping 40 matching lines @@
    */
   final String path;
 }
 
 
 class DirectoryException {
   const DirectoryException(String this.message);
   String toString() => "DirectoryException: $message";
   final String message;
 }