Enable Media query evaluation in the preload scanner

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 210185ef31d373e7382b9358cf672412d8a6b671..4815e3b1eb882cd7c7e76d6f751f8178b1db50cc 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -27,6 +27,7 @@
 #include "core/html/parser/HTMLDocumentParser.h"
 
 #include "HTMLNames.h"
+#include "core/css/MediaValues.h"
 #include "core/dom/DocumentFragment.h"
 #include "core/dom/Element.h"
 #include "core/frame/LocalFrame.h"
@@ -511,6 +512,13 @@ Document* HTMLDocumentParser::contextForParsingSession()
     return document();
 }
 
+static PassRefPtr<MediaValues> createMediaValues(Document* document)
+{
+    RefPtr<MediaValues> mediaValues = MediaValues::create(document, MediaValues::CachingMode);
+    ASSERT(mediaValues->isSafeToSendToAnotherThread());
+    return mediaValues;
+}
+
 void HTMLDocumentParser::pumpTokenizer(SynchronousMode mode)
 {
     ASSERT(!isStopped());
@@ -571,7 +579,7 @@ 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(), document()->devicePixelRatio()));
+            m_preloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), createMediaValues(document())));
             m_preloadScanner->appendToEnd(m_input.current());
         }
         m_preloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -648,7 +656,7 @@ 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(), document()->devicePixelRatio()));
+            m_insertionPreloadScanner = adoptPtr(new HTMLPreloadScanner(m_options, document()->url(), createMediaValues(document())));
 
         m_insertionPreloadScanner->appendToEnd(source);
         m_insertionPreloadScanner->scan(m_preloader.get(), document()->baseElementURL());
@@ -672,7 +680,7 @@ 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(), document()->devicePixelRatio()));
+    config->preloadScanner = adoptPtr(new TokenPreloadScanner(document()->url().copy(), createMediaValues(document())));
     config->decoder = takeDecoder();
 
     ASSERT(config->xssAuditor->isSafeToSendToAnotherThread());