Have srcset respond to viewport changes

Source/core/html/parser/HTMLPreloadScanner.cpp

Index: Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/Source/core/html/parser/HTMLPreloadScanner.cpp b/Source/core/html/parser/HTMLPreloadScanner.cpp
index 70951aeb9323e77072113e8ea71928cd4df1c595..1b21bc89b4408a9bbe189b2d614297b7651b7a3c 100644
--- a/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -117,7 +117,7 @@ public:
         if (match(m_tagImpl, imgTag)
             || match(m_tagImpl, sourceTag)) {
             if (RuntimeEnabledFeatures::pictureSizesEnabled())
-                m_sourceSize = SizesAttributeParser::findEffectiveSize(String(), m_mediaValues);
+                m_sourceSize = SizesAttributeParser(m_mediaValues, String()).length();
             return;
         }
         if ( !match(m_tagImpl, inputTag)
@@ -197,7 +197,7 @@ private:
             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);
+            m_sourceSize = SizesAttributeParser(m_mediaValues, attributeValue).length();
             m_sourceSizeSet = true;
             if (!m_srcsetImageCandidate.isEmpty()) {
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, m_srcsetAttributeValue);
@@ -239,7 +239,7 @@ private:
             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);
+            m_sourceSize = SizesAttributeParser(m_mediaValues, attributeValue).length();
             m_sourceSizeSet = true;
             if (!m_srcsetImageCandidate.isEmpty()) {
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, m_srcsetAttributeValue);