Enable srcset support in HTMLImageElement

Source/core/html/parser/HTMLDocumentParser.cpp

Index: Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/Source/core/html/parser/HTMLDocumentParser.cpp b/Source/core/html/parser/HTMLDocumentParser.cpp
index b5b283ec2f12702866b083d04aa5dcdb9806649d..62372f4d8f4ad46ed42716c2983cdf2efe5da7fb 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -558,7 +558,10 @@ void HTMLDocumentParser::pumpTokenizer(SynchronousMode mode)
     if (isWaitingForScripts()) {
         ASSERT(m_tokenizer->state() == HTMLTokenizer::DataState);
         if (!m_preloadScanner) {
-            m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url()));
+            float deviceScaleFactor = 1.0;
+            if (Page* page = document()->page())
+                deviceScaleFactor = page->deviceScaleFactor();
+            m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), deviceScaleFactor));
             m_preloadScanner->appendToEnd(m_input.current());
         }
         m_preloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -632,8 +635,12 @@ void HTMLDocumentParser::insert(const SegmentedString& source)
     if (isWaitingForScripts()) {
         // Check the document.write() output with a separate preload scanner as
         // the main scanner can't deal with insertions.
-        if (!m_insertionPreloadScanner)
-            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url()));
+        if (!m_insertionPreloadScanner) {
+            float deviceScaleFactor = 1.0;
+            if (Page* page = document()->page())
+                deviceScaleFactor = page->deviceScaleFactor();
+            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), deviceScaleFactor));
+        }
         m_insertionPreloadScanner->appendToEnd(source);
         m_insertionPreloadScanner->scan(m_preloader.get(), document()->baseElementURL());
     }