[Offline Pages] Adding missing image/CSS detection in FrameSerializer.

third_party/WebKit/Source/core/frame/FrameSerializer.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 283 matching lines @@
 
     CString frame_html =
         document.Encoding().Encode(text, WTF::kEntitiesForUnencodables);
     resources_->push_back(SerializedResource(
         url, document.SuggestedMIMEType(),
         SharedBuffer::Create(frame_html.data(), frame_html.length())));
   }
 
   for (Node* node : serialized_nodes) {
     ASSERT(node);
+    delegate_.VisitNode(node);
     if (!node->IsElementNode())
       continue;
 
     Element& element = ToElement(*node);
     // We have to process in-line style as it might contain some resources
     // (typically background images).
     if (element.IsStyledElement()) {
       RetrieveResourcesForProperties(element.InlineStyle(), document);
       RetrieveResourcesForProperties(element.PresentationAttributeStyle(),
                                      document);
@@ skipping 265 matching lines @@
     emits_minus = ch == '-';
     builder.Append(ch);
   }
   CString escaped_url = builder.ToString().Ascii();
   return String::Format("saved from url=(%04d)%s",
                         static_cast<int>(escaped_url.length()),
                         escaped_url.data());
 }
 
 }  // namespace blink