Set referrer for CSS resources

Source/core/css/CSSImageValue.h

Index: Source/core/css/CSSImageValue.h
diff --git a/Source/core/css/CSSImageValue.h b/Source/core/css/CSSImageValue.h
index b81c6a98c5cda9011f1cf1dfaddf04c51912aaba..4dce66191bb6f45d632e3b15dd8323bde5783325 100644
--- a/Source/core/css/CSSImageValue.h
+++ b/Source/core/css/CSSImageValue.h
@@ -23,6 +23,7 @@
 
 #include "core/css/CSSValue.h"
 #include "core/fetch/ResourceFetcher.h"
+#include "platform/weborigin/Referrer.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
@@ -53,6 +54,9 @@ public:
 
     const String& url() { return m_absoluteURL; }
 
+    void setReferrer(const Referrer& referrer) { m_referrer = referrer; }
+    const Referrer& referrer() const { return m_referrer; }
+
     void reResolveURL(const Document&);
 
     String customCSSText() const;
@@ -75,6 +79,7 @@ private:
 
     String m_relativeURL;
     String m_absoluteURL;
+    Referrer m_referrer;
     RefPtr<StyleImage> m_image;
     bool m_accessedImage;
     AtomicString m_initiatorName;