Add uri getter on file system entity.

sdk/lib/core/uri.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 dart.core;
 
 /**
  * A parsed URI, such as a URL.
  *
  * **See also:**
@@ skipping 686 matching lines @@
    * // This throws an error. A path with a drive letter is not absolute.
    * new Uri.file(r"C:xxx\yyy", windows: true);
    *
    * // file://server/share/file
    * new Uri.file(r"\\server\share\file", windows: true);
    * ```
    *
    * If the path passed is not a legal file path [ArgumentError] is thrown.
    */
   factory Uri.file(String path, {bool windows}) {
-    windows = windows == null ? Uri._isWindows : windows;
+    windows = (windows == null) ? Uri._isWindows : windows;
     return windows ? _makeWindowsFileUrl(path) : _makeFileUri(path);
   }
 
   /**
    * Returns the natural base URI for the current platform.
    *
    * When running in a browser this is the current URL (from
    * `window.location.href`).
    *
    * When not running in a browser this is the file URI referencing
@@ skipping 1709 matching lines @@
       0xafff,   // 0x30 - 0x3f  1111111111110101
                 //              @ABCDEFGHIJKLMNO
       0xffff,   // 0x40 - 0x4f  1111111111111111
                 //              PQRSTUVWXYZ    _
       0x87ff,   // 0x50 - 0x5f  1111111111100001
                 //               abcdefghijklmno
       0xfffe,   // 0x60 - 0x6f  0111111111111111
                 //              pqrstuvwxyz   ~
       0x47ff];  // 0x70 - 0x7f  1111111111100010
 }