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 e718a5920aaa2e6eff559eeeb2316bb092a3de72..e377ee671323166e1b8d24cf8291e123a4b7c8e2 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -559,7 +559,7 @@ 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()));
+            m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), document()->devicePixelRatio()));
             m_preloadScanner->appendToEnd(m_input.current());
         }
         m_preloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -634,7 +634,7 @@ void HTMLDocumentParser::insert(const SegmentedString& source)
         // 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()));
+            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), document()->devicePixelRatio()));
 
         m_insertionPreloadScanner->appendToEnd(source);
         m_insertionPreloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -659,7 +659,7 @@ void HTMLDocumentParser::startBackgroundParser()
     config->parser = m_weakFactory.createWeakPtr();
     config->xssAuditor = adoptPtr(new XSSAuditor);
     config->xssAuditor->init(document(), &m_xssAuditorDelegate);
-    config->preloadScanner = adoptPtr(new TokenPreloadScanner(document()->url().copy()));
+    config->preloadScanner = adoptPtr(new TokenPreloadScanner(document()->url().copy(), document()->devicePixelRatio()));
 
     ASSERT(config->xssAuditor->isSafeToSendToAnotherThread());
     ASSERT(config->preloadScanner->isSafeToSendToAnotherThread());