Change libraries map to use Uri.

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 17 matching lines @@
  * of libraries which are not running -- perhaps at compile-time.  In
  * this case, all available reflective functionality would be
  * supported, but runtime functionality (such as invoking a function
  * or inspecting the contents of a variable) would fail dynamically.
  */
 abstract class MirrorSystem {
   /**
    * An immutable map from from library names to mirrors for all
    * libraries known to this mirror system.
    */
-  // TODO(ahe): [libraries] should be Map<Uri, LibraryMirror>.
-  Map<Symbol, LibraryMirror> get libraries;
+  Map<Uri, LibraryMirror> get libraries;
+
+  /**
+   * Returns an iterable of all libraries in the mirror system whose library
+   * name is [libraryName].
+   */
+  Iterable<LibraryMirror> findLibrary(Symbol libraryName) {
+    return libraries.values.where(
+        (library) => library.simpleName == libraryName);
+  }
 
   /**
    * A mirror on the isolate associated with this [MirrorSystem].
    * This may be null if this mirror system is not running.
    */
   IsolateMirror get isolate;
 
   /**
    * A mirror on the [:dynamic:] type.
    */
@@ skipping 769 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);
 }