Implement LibraryMirror.metadata.

dart/sdk/lib/mirrors/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.
 
 // For the purposes of the mirrors library, we adopt a naming
 // convention with respect to getters and setters.  Specifically, for
 // some variable or field...
 //
 //   var myField;
 //
@@ skipping 158 matching lines @@
    *
    * This is defined to be equivalent to:
    *    [:mirror.owner != null && mirror.owner is LibraryMirror:]
    */
   bool get isTopLevel;
 
   /**
    * The source location of this Dart language entity.
    */
   SourceLocation get location;
+
+  /**
+   * A list of the metadata associated with this declaration.
+   */
+  List<InstanceMirror> get metadata;
 }
 
 /**
  * An [ObjectMirror] is a common superinterface of [InstanceMirror],
  * [ClassMirror], and [LibraryMirror] that represents their shared
  * functionality.
  *
  * For the purposes of the mirrors library, these types are all
  * object-like, in that they support method invocation and field
  * access.  Real Dart objects are represented by the [InstanceMirror]
@@ skipping 637 matching lines @@
   /**
    * Is [:true:] if this comment is a documentation comment.
    *
    * That is, that the comment is either enclosed in [: /** ... */ :] or starts
    * with [: /// :].
    */
   final bool isDocComment;
 
   const Comment(this.text, this.trimmedText, this.isDocComment);
 }