Implement referrerpolicy attribute for img elements

Source/core/loader/ImageLoader.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2009 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 67 matching lines @@
         UpdateSizeChanged,
         // This force the image to refetch and reload the image source, even if it has not changed.
         UpdateForcedReload
     };
 
     enum BypassMainWorldBehavior {
         BypassMainWorldCSP,
         DoNotBypassMainWorldCSP
     };
 
-    void updateFromElement(UpdateFromElementBehavior = UpdateNormal);
+    void updateFromElement(UpdateFromElementBehavior = UpdateNormal, ReferrerPolicy = ReferrerPolicyDefault);
 
     void elementDidMoveToNewDocument();
 
     Element* element() const { return m_element; }
     bool imageComplete() const
     {
         return m_imageComplete && !m_pendingTask;
     }
 
     ImageResource* image() const { return m_image.get(); }
@@ skipping 15 matching lines @@
     void removeClient(ImageLoaderClient*);
 
     bool getImageAnimationPolicy(ImageResource*, ImageAnimationPolicy&) final;
 protected:
     void notifyFinished(Resource*) override;
 
 private:
     class Task;
 
     // Called from the task or from updateFromElement to initiate the load.
-    void doUpdateFromElement(BypassMainWorldBehavior, UpdateFromElementBehavior);
+    void doUpdateFromElement(BypassMainWorldBehavior, UpdateFromElementBehavior, ReferrerPolicy = ReferrerPolicyDefault);
 
     virtual void dispatchLoadEvent() = 0;
     virtual void noImageResourceToLoad() { }
 
     void updatedHasPendingEvent();
 
     void dispatchPendingLoadEvent();
     void dispatchPendingErrorEvent();
 
     LayoutImageResource* layoutImageResource();
     void updateLayoutObject();
 
     void setImageWithoutConsideringPendingLoadEvent(ImageResource*);
     void sourceImageChanged();
     void clearFailedLoadURL();
     void dispatchErrorEvent();
     void crossSiteOrCSPViolationOccurred(AtomicString);
-    void enqueueImageLoadingMicroTask(UpdateFromElementBehavior);
+    void enqueueImageLoadingMicroTask(UpdateFromElementBehavior, ReferrerPolicy);
 
     void timerFired(Timer<ImageLoader>*);
 
     KURL imageSourceToKURL(AtomicString) const;
 
     // Used to determine whether to immediately initiate the load
     // or to schedule a microtask.
     bool shouldLoadImmediately(const KURL&) const;
 
     void willRemoveClient(ImageLoaderClient&);
@@ skipping 27 matching lines @@
     bool m_imageComplete : 1;
     bool m_loadingImageDocument : 1;
     bool m_elementIsProtected : 1;
     bool m_suppressErrorEvents : 1;
     unsigned m_highPriorityClientCount;
 };
 
 }
 
 #endif