Change Lo-Fi bool to bitmask to support multiple Previews types

third_party/WebKit/Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 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 280 matching lines @@
   AtomicString imageSourceURL = m_element->imageSourceURL();
   ImageResourceContent* newImage = nullptr;
   if (!url.isNull()) {
     // Unlike raw <img>, we block mixed content inside of <picture> or
     // <img srcset>.
     ResourceLoaderOptions resourceLoaderOptions =
         ResourceFetcher::defaultResourceOptions();
     ResourceRequest resourceRequest(url);
     if (updateBehavior == UpdateForcedReload) {
       resourceRequest.setCachePolicy(WebCachePolicy::BypassingCache);
-      resourceRequest.setLoFiState(WebURLRequest::LoFiOff);
+      resourceRequest.setPreviewsState(WebURLRequest::PreviewsOff);
     }
 
     if (referrerPolicy != ReferrerPolicyDefault) {
       resourceRequest.setHTTPReferrer(SecurityPolicy::generateReferrer(
           referrerPolicy, url, document.outgoingReferrer()));
     }
 
     if (isHTMLPictureElement(element()->parentNode()) ||
         !element()->fastGetAttribute(HTMLNames::srcsetAttr).isNull())
       resourceRequest.setRequestContext(WebURLRequest::RequestContextImageSet);
@@ skipping 322 matching lines @@
 }
 
 void ImageLoader::elementDidMoveToNewDocument() {
   if (m_loadDelayCounter)
     m_loadDelayCounter->documentChanged(m_element->document());
   clearFailedLoadURL();
   setImage(0);
 }
 
 }  // namespace blink