introduce web_components pkg for consolidated polyfills

pkg/polymer/lib/deploy.dart

 // Copyright (c) 2013, 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.
 
 /**
  * **Note**: If you already have a `build.dart` in your application, we
  * recommend to use the `package:polymer/builder.dart` library instead.
 
  * Temporary deploy command used to create a version of the app that can be
  * compiled with dart2js and deployed. Following pub layout conventions, this
@@ skipping 99 matching lines @@
       ..addOption('out', abbr: 'o', help: 'Directory to generate files into.',
           defaultsTo: 'out')
       ..addOption('test', help: 'Deploy the test at the given path.\n'
           'Note: currently this will deploy all tests in its directory,\n'
           'but it will eventually deploy only the specified test.')
       ..addFlag('js', help:
           'deploy replaces *.dart scripts with *.dart.js. This flag \n'
           'leaves "packages/browser/dart.js" to do the replacement at runtime.',
           defaultsTo: true)
       ..addFlag('debug', help:
-          'run in debug mode. For example, use the debug versions of the \n'
-          'polyfills (shadow_dom.debug.js and custom-elements.debug.js) \n'
-          'instead of the minified versions.',
+          'run in debug mode. For example, use the debug polyfill \n'
+          'web_components/platform.concat.js instead of the minified one.\n',
           defaultsTo: false)
       ..addFlag('csp', help:
           'replaces *.dart with *.dart.precompiled.js to comply with \n'
           'Content Security Policy restrictions.');
   try {
     var results = parser.parse(arguments);
     if (results['help']) {
       _showUsage(parser);
       return null;
     }
     return results;
   } on FormatException catch (e) {
     print(e.message);
     _showUsage(parser);
     return null;
   }
 }
 
 _showUsage(parser) {
   print('Usage: dart --package-root=packages/ '
       'package:polymer/deploy.dart [options]');
   print(parser.getUsage());
 }