Move Nathan's HTML scripts over and rename to apidoc.

utils/apidoc/html_diff.dart

 // Copyright (c) 2011, 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.
 
 /**
  * A script to assist in documenting the difference between the dart:html API
  * and the old DOM API.
  */
 #library('html_diff');
 
-#import('../../../frog/lang.dart');
-#import('../../../frog/file_system_node.dart');
-#import('../../../frog/file_system.dart');
-#import('../../../utils/dartdoc/dartdoc.dart');
+#import('../../frog/lang.dart');
+#import('../../frog/file_system_node.dart');
+#import('../../frog/file_system.dart');
+#import('../dartdoc/dartdoc.dart');
 
 void main() {
   var files = new NodeFileSystem();
   parseOptions('../../frog', [] /* args */, files);
   initializeWorld(files);
   initializeDartDoc();
   HtmlDiff.initialize();
 
   var diff = new HtmlDiff();
   diff.run();
@@ skipping 400 matching lines @@
   Map<String, String> _getTags(String comment) {
     if (comment == null) return const <String>{};
     final re = new RegExp("@([a-zA-Z]+) ([^;]+)(?:;|\$)");
     final tags = <String>{};
     for (var m in re.allMatches(comment.trim())) {
       tags[m[1]] = m[2];
     }
     return tags;
   }
 }