Add UseCounters for referrerpolicy attributes

third_party/WebKit/Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 249 matching lines @@
     }
   } else if (name == srcAttr || name == srcsetAttr || name == sizesAttr) {
     selectSourceURL(ImageLoader::UpdateIgnorePreviousError);
   } else if (name == usemapAttr) {
     setIsLink(!params.newValue.isNull());
   } else if (name == referrerpolicyAttr) {
     m_referrerPolicy = ReferrerPolicyDefault;
     if (!params.newValue.isNull()) {
       SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(
           params.newValue, &m_referrerPolicy);
+      UseCounter::count(document(),
+                        UseCounter::HTMLImageElementReferrerPolicyAttribute);
     }
   } else {
     HTMLElement::parseAttribute(params);
   }
 }
 
 String HTMLImageElement::altText() const {
   // lets figure out the alt text.. magic stuff
   // http://www.w3.org/TR/1998/REC-html40-19980424/appendix/notes.html#altgen
   // also heavily discussed by Hixie on bugzilla
@@ skipping 630 matching lines @@
 void HTMLImageElement::associateWith(HTMLFormElement* form) {
   if (form && form->isConnected()) {
     m_form = form;
     m_formWasSetByParser = true;
     m_form->associate(*this);
     m_form->didAssociateByParser();
   }
 };
 
 }  // namespace blink