In the extension docs builder, allow DOM nodes to be specified as "volatile"

chrome/common/extensions/docs/js/api_page_generator.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview This file is the controller for generating extension
  * doc pages.
  *
  * It expects to have available via XHR (relative path):
  *   1) API_TEMPLATE which is the main template for the api pages.
@@ skipping 404 matching lines @@
                       'jsinstance'];
 
   var nodes = root.getElementsByTagName('*');
   var displayNone = [];
 
   for (var i = 0; i < nodes.length; i++) {
     var n = nodes[i]
 
     // Delete nodes which are hidden. There are lots of these since jsdisplay
     // just hides nodes, not deletes them.
-    if (n.style && n.style.display === 'none') {
+    if (!n.hasAttribute('volatile') && n.style && n.style.display === 'none') {
       displayNone.push(n);
       continue;
+    } else {
+      n.removeAttribute('volatile');
     }
 
     // Delete empty style attributes (this can happen when jsdisplay causes
     // display values other than 'none').
     var styleAttribute = n.getAttribute('style');
     if (typeof(styleAttribute) === 'string' && styleAttribute.trim() === '') {
       n.removeAttribute('style');
     }
 
     // Remove jstemplate attributes from nodes that stick around.
@@ skipping 417 matching lines @@
   }
   if (a.name > b.name) {
     return 1;
   }
   return 0;
 }
 
 function disableDocs(obj) {
   return !!obj.nodoc;
 }