Sort packages before listing them.

utils/pub/command_list.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.
 
 /**
  * Handles the `list` pub command. This is mostly just used so we can pull
  * some basic data out of pub in the integration tests. Once pub is more
  * full-featured and has other commands that test everything it does, this
  * may go away.
  */
 class ListCommand extends PubCommand {
   String get description() => 'print the contents of repositories';
 
   void onRun() {
     cache.listAll().then((packages) {
+      packages.sort((a, b) => a.name.compareTo(b.name));
       for (final package in packages) {
         print(package.name);
       }
     });
   }
 }