add disqus comments

lib/dartdoc/client-shared.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.
 
 // Code shared between the different client-side libraries.
 
 /**
  * Finds all code blocks and makes them toggleable. Syntax highlights each
  * code block the first time it's shown.
  */
 enableCodeBlocks() {
   for (var elem in document.queryAll('.method, .field')) {
     var showCode = elem.query('.show-code');
 
     // Skip it if we don't have a code link. Will happen if source code is
     // disabled.
     if (showCode == null) continue;
 
     var pre = elem.query('pre.source');
+
     showCode.on.click.add((e) {
       if (pre.classes.contains('expanded')) {
         pre.classes.remove('expanded');
       } else {
         // Syntax highlight.
         if (!pre.classes.contains('formatted')) {
           pre.innerHTML = classifySource(new frog.SourceFile('', pre.text));
           pre.classes.add('formatted');
         };
         pre.classes.add('expanded');
       }
     });
+
   }
 }