Set referrer for CSS resources

Source/core/css/StyleRuleImport.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 56 matching lines @@
     StyleRuleBase::traceAfterDispatch(visitor);
 }
 
 void StyleRuleImport::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* cachedStyleSheet)
 {
     if (m_styleSheet)
         m_styleSheet->clearOwnerRule();
 
     CSSParserContext context = m_parentStyleSheet ? m_parentStyleSheet->parserContext() : strictCSSParserContext();
     context.setCharset(charset);
-    if (!baseURL.isNull())
+    Document* document = m_parentStyleSheet ? m_parentStyleSheet->singleOwnerDocument() : 0;
+    if (!baseURL.isNull()) {
         context.setBaseURL(baseURL);
+        if (document)
+            context.setReferrer(Referrer(baseURL.strippedForUseAsReferrer(), document->referrerPolicy()));
+    }
 
     m_styleSheet = StyleSheetContents::create(this, href, context);
 
-    Document* document = m_parentStyleSheet ? m_parentStyleSheet->singleOwnerDocument() : 0;
     m_styleSheet->parseAuthorStyleSheet(cachedStyleSheet, document ? document->securityOrigin() : 0);
 
     m_loading = false;
 
     if (m_parentStyleSheet) {
         m_parentStyleSheet->notifyLoadedSheet(cachedStyleSheet);
         m_parentStyleSheet->checkLoaded();
     }
 }
 
@@ skipping 38 matching lines @@
         // removed from the pending sheet count, so let the doc know
         // the sheet being imported is pending.
         if (m_parentStyleSheet && m_parentStyleSheet->loadCompleted() && rootSheet == m_parentStyleSheet)
             m_parentStyleSheet->startLoadingDynamicSheet();
         m_loading = true;
         m_resource->addClient(&m_styleSheetClient);
     }
 }
 
 } // namespace WebCore