Add property base to the Uri class

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 340 matching lines @@
    *     new Uri.file(r"C:");  // Throws as path with drive letter
    *                           // is not absolute.
    *
    * 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;
     return windows ? _makeWindowsFileUrl(path) : _makeFileUri(path);
   }
 
+  /**
+   * Returns the natural base URI for the current platform.
+   *
+   * When running in a browser this will be the current URL (from

[floitsch, 2013/09/18 09:06:26]

is the current URL

[Søren Gjesse, 2013/09/25 09:17:08]

Done.

+   * `window.location.href`).
+   *
+   * When not running in a browser this will be a file URI referencing

[floitsch, 2013/09/18 09:06:26]

is the file URI ...

[Søren Gjesse, 2013/09/25 09:17:08]

Done.

+   * the current working directory.
+   */
+  external static Uri get base;
+
   external static bool get _isWindows;
 
   static _checkNonWindowsPathReservedCharacters(List<String> segments,
                                                 bool argumentError) {
     segments.forEach((segment) {
       if (segment.contains("/")) {
         if (argumentError) {
           throw new ArgumentError("Illegal path character $segment");
         } else {
           throw new UnsupportedError("Illegal path character $segment");
@@ skipping 1292 matching lines @@
   void clear() {
     throw new UnsupportedError("Cannot modify an unmodifiable map");
   }
   void forEach(void f(K key, V value)) => _map.forEach(f);
   Iterable<K> get keys => _map.keys;
   Iterable<V> get values => _map.values;
   int get length => _map.length;
   bool get isEmpty => _map.isEmpty;
   bool get isNotEmpty => _map.isNotEmpty;
 }