Add CORS support for <link> elements.

Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 160 matching lines @@
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_deviceScaleFactor, attributeValue);
                 setUrlToLoad(bestFitSourceForImageAttributes(m_deviceScaleFactor, m_urlToLoad, m_srcsetImageCandidate), AllowURLReplacement);
             }
         } else if (match(m_tagImpl, linkTag)) {
             if (match(attributeName, hrefAttr))
                 setUrlToLoad(attributeValue, DisallowURLReplacement);
             else if (match(attributeName, relAttr))
                 m_linkIsStyleSheet = relAttributeIsStyleSheet(attributeValue);
             else if (match(attributeName, mediaAttr))
                 m_mediaAttribute = attributeValue;
+            else if (match(attributeName, crossoriginAttr))
+                setCrossOriginAllowed(attributeValue);
         } else if (match(m_tagImpl, inputTag)) {
             if (match(attributeName, srcAttr))
                 setUrlToLoad(attributeValue, DisallowURLReplacement);
             else if (match(attributeName, typeAttr))
                 m_inputIsImage = equalIgnoringCase(attributeValue, InputTypeNames::image);
         }
     }
 
     static bool relAttributeIsStyleSheet(const String& attributeValue)
     {
@@ skipping 210 matching lines @@
         if (m_token.type() == HTMLToken::StartTag)
             m_tokenizer->updateStateFor(attemptStaticStringCreation(m_token.name(), Likely8Bit));
         m_scanner.scan(m_token, m_source, requests);
         m_token.clear();
     }
 
     preloader->takeAndPreload(requests);
 }
 
 }