Add ImageLoader support for sizes based Client-Hints RW values

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 186 matching lines @@
 }
 
 static void configureRequest(FetchRequest& request, ImageLoader::BypassMainWorldBehavior bypassBehavior, Element& element)
 {
     if (bypassBehavior == ImageLoader::BypassMainWorldCSP)
         request.setContentSecurityCheck(DoNotCheckContentSecurityPolicy);
 
     AtomicString crossOriginMode = element.fastGetAttribute(HTMLNames::crossoriginAttr);
     if (!crossOriginMode.isNull())
         request.setCrossOriginAccessControl(element.document().securityOrigin(), crossOriginMode);
+
+    if (isHTMLImageElement(element)) {
+        FetchRequest::ResourceWidth resourceWidth;
+        resourceWidth.width = toHTMLImageElement(element).sourceSize(element);
+        resourceWidth.isSet = true;
+        request.setResourceWidth(resourceWidth);
+    }
 }
 
 inline void ImageLoader::dispatchErrorEvent()
 {
     m_hasPendingErrorEvent = true;
     errorEventSender().dispatchEventSoon(this);
 }
 
 inline void ImageLoader::crossSiteOrCSPViolationOccurred(AtomicString imageSourceURL)
 {
@@ skipping 388 matching lines @@
 #endif
 }
 
 #if ENABLE(OILPAN)
 ImageLoader::ImageLoaderClientRemover::~ImageLoaderClientRemover()
 {
     m_loader.willRemoveClient(m_client);
 }
 #endif
 }