A thread-safe Media Query Parser

Source/core/css/MediaList.cpp

Index: Source/core/css/MediaList.cpp
diff --git a/Source/core/css/MediaList.cpp b/Source/core/css/MediaList.cpp
index 11ae84b35d4a9b81b01b72d0a684dbc8633b60ca..107c250d6a7c07af303d503e44ef342f43701533 100644
--- a/Source/core/css/MediaList.cpp
+++ b/Source/core/css/MediaList.cpp
@@ -26,6 +26,8 @@
 #include "core/css/MediaFeatureNames.h"
 #include "core/css/MediaQuery.h"
 #include "core/css/MediaQueryExp.h"
+#include "core/css/parser/CSSToken.h"
+#include "core/css/parser/MediaQueryParser.h"
 #include "core/dom/Document.h"
 #include "core/frame/DOMWindow.h"
 #include "wtf/text/StringBuilder.h"
@@ -73,8 +75,12 @@ PassRefPtr<MediaQuerySet> MediaQuerySet::create(const String& mediaString)
     if (mediaString.isEmpty())
         return MediaQuerySet::create();
 
+    /*
     BisonCSSParser parser(strictCSSParserContext());
     return parser.parseMediaQueryList(mediaString);
+    */
+    return MediaQueryParser::parse(mediaString);
+
 }
 
 bool MediaQuerySet::set(const String& mediaString)
@@ -252,7 +258,7 @@ static void addResolutionWarningMessageToConsole(Document* document, const Strin
     document->addConsoleMessage(CSSMessageSource, DebugMessageLevel, message.toString());
 }
 
-static inline bool isResolutionMediaFeature(const AtomicString& mediaFeature)
+static inline bool isResolutionMediaFeature(const String& mediaFeature)
 {
     return mediaFeature == MediaFeatureNames::resolutionMediaFeature
         || mediaFeature == MediaFeatureNames::maxResolutionMediaFeature