Add ReferrerPolicy support to preload

third_party/WebKit/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 339 matching lines @@
       m_matched &= mediaAttributeMatches(*m_mediaValues, attributeValue);
     } else if (match(attributeName, crossoriginAttr)) {
       setCrossOrigin(attributeValue);
     } else if (match(attributeName, nonceAttr)) {
       setNonce(attributeValue);
     } else if (match(attributeName, asAttr)) {
       m_asAttributeValue = attributeValue;
     } else if (match(attributeName, typeAttr)) {
       m_matched &= MIMETypeRegistry::isSupportedStyleSheetMIMEType(
           ContentType(attributeValue).type());
+    } else if (!m_referrerPolicySet &&
+               match(attributeName, referrerpolicyAttr) &&
+               !attributeValue.isNull()) {
+      m_referrerPolicySet = true;
+      SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(
+          attributeValue, &m_referrerPolicy);
     }
   }
 
   template <typename NameType>
   void processInputAttribute(const NameType& attributeName,
                              const String& attributeValue) {
     // FIXME - Don't set type multiple times.
     if (match(attributeName, srcAttr))
       setUrlToLoad(attributeValue, DisallowURLReplacement);
     else if (match(attributeName, typeAttr))
@@ skipping 519 matching lines @@
   defaultViewportMinWidth = document->viewportDefaultMinWidth();
   viewportMetaZeroValuesQuirk =
       document->settings() &&
       document->settings()->viewportMetaZeroValuesQuirk();
   viewportMetaEnabled =
       document->settings() && document->settings()->viewportMetaEnabled();
   referrerPolicy = document->getReferrerPolicy();
 }
 
 }  // namespace blink