Add link preload as=document support

third_party/WebKit/Source/platform/exported/WebURLRequest.cpp

 /*
  * Copyright (C) 2009 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 388 matching lines @@
 WebURLRequest::LoFiState WebURLRequest::getLoFiState() const
 {
     return m_resourceRequest->loFiState();
 }
 
 void WebURLRequest::setLoFiState(WebURLRequest::LoFiState loFiState)
 {
     return m_resourceRequest->setLoFiState(loFiState);
 }
 
+bool WebURLRequest::linkPreload() const
+{
+    return m_resourceRequest->linkPreload();
+}
+
 WebURLRequest::ExtraData* WebURLRequest::getExtraData() const
 {
     RefPtr<ResourceRequest::ExtraData> data = m_resourceRequest->getExtraData();
     if (!data)
         return 0;
     return static_cast<ExtraDataContainer*>(data.get())->getExtraData();
 }
 
 void WebURLRequest::setExtraData(WebURLRequest::ExtraData* extraData)
 {
@@ skipping 68 matching lines @@
     DCHECK(m_resourceRequest);
     return *m_resourceRequest;
 }
 
 WebURLRequest::WebURLRequest(ResourceRequest& r)
     : m_resourceRequest(&r)
 {
 }
 
 } // namespace blink