Have srcset respond to viewport changes

Source/core/html/parser/HTMLPreloadScanner.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc. http://www.torchmobile.com/
  * Copyright (C) 2010 Google Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 98 matching lines @@
         , m_matchedMediaAttribute(true)
         , m_inputIsImage(false)
         , m_sourceSize(0)
         , m_sourceSizeSet(false)
         , m_isCORSEnabled(false)
         , m_allowCredentials(DoNotAllowStoredCredentials)
         , m_mediaValues(mediaValues)
     {
         if (match(m_tagImpl, imgTag)
             || match(m_tagImpl, sourceTag)) {
-            if (RuntimeEnabledFeatures::pictureSizesEnabled())
-                m_sourceSize = SizesAttributeParser::findEffectiveSize(String(), m_mediaValues);
+            if (RuntimeEnabledFeatures::pictureSizesEnabled()) {
+                SizesAttributeParser parser = SizesAttributeParser(m_mediaValues, String());
+                m_sourceSize = parser.length();
+            }
             return;
         }
         if ( !match(m_tagImpl, inputTag)
             && !match(m_tagImpl, linkTag)
             && !match(m_tagImpl, scriptTag))
             m_tagImpl = 0;
     }
 
     enum URLReplacement {
         AllowURLReplacement,
@@ skipping 59 matching lines @@
         if (match(attributeName, srcAttr) && m_imgSrcUrl.isNull()) {
             m_imgSrcUrl = attributeValue;
             setUrlToLoad(bestFitSourceForImageAttributes(m_mediaValues->devicePixelRatio(), m_sourceSize, attributeValue, m_srcsetImageCandidate), AllowURLReplacement);
         } else if (match(attributeName, crossoriginAttr)) {
             setCrossOriginAllowed(attributeValue);
         } else if (match(attributeName, srcsetAttr) && m_srcsetImageCandidate.isEmpty()) {
             m_srcsetAttributeValue = attributeValue;
             m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, attributeValue);
             setUrlToLoad(bestFitSourceForImageAttributes(m_mediaValues->devicePixelRatio(), m_sourceSize, m_imgSrcUrl, m_srcsetImageCandidate), AllowURLReplacement);
         } else if (RuntimeEnabledFeatures::pictureSizesEnabled() && match(attributeName, sizesAttr) && !m_sourceSizeSet) {
-            m_sourceSize = SizesAttributeParser::findEffectiveSize(attributeValue, m_mediaValues);
+            SizesAttributeParser parser = SizesAttributeParser(m_mediaValues, attributeValue);
+            m_sourceSize = parser.length();
             m_sourceSizeSet = true;
             if (!m_srcsetImageCandidate.isEmpty()) {
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, m_srcsetAttributeValue);
                 setUrlToLoad(bestFitSourceForImageAttributes(m_mediaValues->devicePixelRatio(), m_sourceSize, m_imgSrcUrl, m_srcsetImageCandidate), AllowURLReplacement);
             }
         }
     }
 
     template<typename NameType>
     void processLinkAttribute(const NameType& attributeName, const String& attributeValue)
@@ skipping 21 matching lines @@
 
     template<typename NameType>
     void processSourceAttribute(const NameType& attributeName, const String& attributeValue)
     {
         if (!RuntimeEnabledFeatures::pictureEnabled())
             return;
         if (match(attributeName, srcsetAttr) && m_srcsetImageCandidate.isEmpty()) {
             m_srcsetAttributeValue = attributeValue;
             m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, attributeValue);
         } else if (match(attributeName, sizesAttr) && !m_sourceSizeSet) {
-            m_sourceSize = SizesAttributeParser::findEffectiveSize(attributeValue, m_mediaValues);
+            SizesAttributeParser parser = SizesAttributeParser(m_mediaValues, attributeValue);
+            m_sourceSize = parser.length();
             m_sourceSizeSet = true;
             if (!m_srcsetImageCandidate.isEmpty()) {
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, m_srcsetAttributeValue);
             }
         } else if (match(attributeName, mediaAttr)) {
             // FIXME - Don't match media multiple times.
             m_matchedMediaAttribute = mediaAttributeMatches(*m_mediaValues, attributeValue);
         }
 
     }
@@ skipping 247 matching lines @@
         if (m_token.type() == HTMLToken::StartTag)
             m_tokenizer->updateStateFor(attemptStaticStringCreation(m_token.name(), Likely8Bit));
         m_scanner.scan(m_token, m_source, requests);
         m_token.clear();
     }
 
     preloader->takeAndPreload(requests);
 }
 
 }