Fixes documentation generation for dart:html.

pkg/dartdoc/lib/mirrors.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.
 
 #library('mirrors');
 
 #import('dart:io');
 #import('dart:uri');
 
 // TODO(rnystrom): Use "package:" URL (#4968).
@@ skipping 114 matching lines @@
 
   /**
    * Returns an iterable over all types in the library.
    */
   Map<String, InterfaceMirror> get types;
 
   /**
    * Returns the source location for this library.
    */
   Location get location;
+
+  /**
+   * Returns the canonical URI for this library.
+   */
+  Uri get uri;
 }
 
 /**
  * Common interface for classes, interfaces, typedefs and type variables.
  */
 abstract class TypeMirror implements Mirror {
   /**
    * Returns the source location for this type.
    */
   Location get location;
@@ skipping 350 matching lines @@
   /**
    * Returns the URI where the source originated.
    */
   Uri get uri;
 
   /**
    * Returns the text of this source.
    */
   String get text;
 }