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

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

Index: chrome/common/extensions/docs/js/api_page_generator.js
diff --git a/chrome/common/extensions/docs/js/api_page_generator.js b/chrome/common/extensions/docs/js/api_page_generator.js
index ee1d51a8644822b78a0c703c7948e459d7e16917..cb5bb82c188bcb7e35450490c7ed0f4a8562695f 100644
--- a/chrome/common/extensions/docs/js/api_page_generator.js
+++ b/chrome/common/extensions/docs/js/api_page_generator.js
@@ -422,9 +422,11 @@ function cleanupJstemplateMess(root) {
 
     // 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