Add UseCounters for referrerpolicy attributes

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. 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
@@ skipping 95 matching lines @@
       HTMLDocument& document = toHTMLDocument(this->document());
       document.removeExtraNamedItem(m_name);
       document.addExtraNamedItem(value);
     }
     m_name = value;
   } else if (name == sandboxAttr) {
     m_sandbox->setValue(value);
     UseCounter::count(document(), UseCounter::SandboxViaIFrame);
   } else if (name == referrerpolicyAttr) {
     m_referrerPolicy = ReferrerPolicyDefault;
-    if (!value.isNull())
+    if (!value.isNull()) {
       SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(
           value, &m_referrerPolicy);
+      UseCounter::count(document(),
+                        UseCounter::HTMLIFrameElementReferrerPolicyAttribute);
+    }
   } else if (name == allowfullscreenAttr) {
     bool oldAllowFullscreen = m_allowFullscreen;
     m_allowFullscreen = !value.isNull();
     if (m_allowFullscreen != oldAllowFullscreen)
       frameOwnerPropertiesChanged();
   } else if (name == allowpaymentrequestAttr) {
     bool oldAllowPaymentRequest = m_allowPaymentRequest;
     m_allowPaymentRequest = !value.isNull();
     if (m_allowPaymentRequest != oldAllowPaymentRequest)
       frameOwnerPropertiesChanged();
@@ skipping 83 matching lines @@
 bool HTMLIFrameElement::initializePermissionsAttribute() {
   if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
     return false;
 
   if (!m_permissions)
     m_permissions = HTMLIFrameElementPermissions::create(this);
   return true;
 }
 
 }  // namespace blink