Add ReferrerPolicy support to preload

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/LinkStyle.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/SubresourceIntegrity.h"
@@ skipping 270 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 92 matching lines @@
     removePendingSheet();
 }
 
 DEFINE_TRACE(LinkStyle) {
   visitor->trace(m_sheet);
   LinkResource::trace(visitor);
   ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 }  // namespace blink