Add ReferrerPolicy support to preload

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com)
  * Copyright (C) 2011 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
@@ skipping 85 matching lines @@
     // Log href attribute before logging resource fetching in process().
     logUpdateAttributeIfIsolatedWorldAndInDocument("link", hrefAttr, oldValue,
                                                    value);
     process();
   } else if (name == typeAttr) {
     m_type = value;
     process();
   } else if (name == asAttr) {
     m_as = value;
     process();
+  } else if (name == referrerpolicyAttr) {
+    m_referrerPolicy = value;
   } else if (name == sizesAttr) {
     m_sizes->setValue(value);
   } else if (name == mediaAttr) {
     m_media = value.lower();
     process();
   } else if (name == scopeAttr) {
     m_scope = value;
     process();
   } else if (name == disabledAttr) {
     UseCounter::count(document(), UseCounter::HTMLLinkElementDisabled);
     if (LinkStyle* link = linkStyle())
       link->setDisabledState(!value.isNull());
   } else {
     if (name == titleAttr) {
       if (LinkStyle* link = linkStyle())
         link->setSheetTitle(value, StyleEngine::UpdateActiveSheets);
     }
 
     HTMLElement::parseAttribute(name, oldValue, value);
   }
 }
 
 bool HTMLLinkElement::shouldLoadLink() {
   return isInDocumentTree() || (isConnected() && m_relAttribute.isStyleSheet());
 }
 
 bool HTMLLinkElement::loadLink(const String& type,
                                const String& as,
                                const String& media,
+                               const String& referrerPolicy,
                                const KURL& url) {
   return m_linkLoader->loadLink(
       m_relAttribute,
       crossOriginAttributeValue(fastGetAttribute(HTMLNames::crossoriginAttr)),
-      type, as, media, url, document(), NetworkHintsInterfaceImpl());
+      type, as, media, referrerPolicy, url, document(),
+      NetworkHintsInterfaceImpl());
 }
 
 LinkResource* HTMLLinkElement::linkResourceToProcess() {
   if (!shouldLoadLink()) {
     DCHECK(!linkStyle() || !linkStyle()->hasSheet());
     return nullptr;
   }
 
   if (!m_link) {
     if (m_relAttribute.isImport()) {
@@ skipping 461 matching lines @@
         m_owner->document().getSecurityOrigin());
   }
   m_fetchFollowingCORS = false;
 }
 
 void LinkStyle::process() {
   DCHECK(m_owner->shouldProcessStyle());
   String type = m_owner->typeValue().lower();
   String as = m_owner->asValue().lower();
   String media = m_owner->media().lower();
+  String referrerPolicy = m_owner->referrerPolicy().lower();
   LinkRequestBuilder builder(m_owner);
 
   if (m_owner->relAttribute().getIconType() != InvalidIcon &&
       builder.url().isValid() && !builder.url().isEmpty()) {
     if (!m_owner->shouldLoadLink())
       return;
     if (!document().getSecurityOrigin()->canDisplay(builder.url()))
       return;
     if (!document().contentSecurityPolicy()->allowImageFromSource(
             builder.url()))
       return;
     if (document().frame() && document().frame()->loader().client())
       document().frame()->loader().client()->dispatchDidChangeIcons(
           m_owner->relAttribute().getIconType());
   }
 
-  if (!m_owner->loadLink(type, as, media, builder.url()))
+  if (!m_owner->loadLink(type, as, media, referrerPolicy, builder.url()))
     return;
 
   if (m_disabledState != Disabled && m_owner->relAttribute().isStyleSheet() &&
       styleSheetTypeIsSupported(type) && shouldLoadResource() &&
       builder.url().isValid()) {
     if (resource()) {
       removePendingSheet();
       clearResource();
       clearFetchFollowingCORS();
     }
@@ skipping 86 matching lines @@
     removePendingSheet();
 }
 
 DEFINE_TRACE(LinkStyle) {
   visitor->trace(m_sheet);
   LinkResource::trace(visitor);
   ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 }  // namespace blink