Make the MediaQueryList listener an EventListener

Source/core/css/MediaQueryMatcher.cpp

Index: Source/core/css/MediaQueryMatcher.cpp
diff --git a/Source/core/css/MediaQueryMatcher.cpp b/Source/core/css/MediaQueryMatcher.cpp
index 795b2eda01e554d2eadff3c9fa24666bee04c476..066cddc935d7817be427e647dd63e0ce80f17fbe 100644
--- a/Source/core/css/MediaQueryMatcher.cpp
+++ b/Source/core/css/MediaQueryMatcher.cpp
@@ -23,6 +23,7 @@
 #include "core/css/MediaList.h"
 #include "core/css/MediaQueryEvaluator.h"
 #include "core/css/MediaQueryList.h"
+#include "core/css/MediaQueryListEvent.h"
 #include "core/css/MediaQueryListListener.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Document.h"
@@ -91,7 +92,7 @@ PassRefPtrWillBeRawPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const Strin
     RefPtrWillBeRawPtr<MediaQuerySet> media = MediaQuerySet::create(query);
     // Add warning message to inspector whenever dpi/dpcm values are used for "screen" media.
     reportMediaQueryWarningIfNeeded(m_document, media.get());
-    return MediaQueryList::create(this, media);
+    return MediaQueryList::create(this, media, m_document);
 }
 
 void MediaQueryMatcher::addMediaQueryList(MediaQueryList* query)
@@ -114,8 +115,13 @@ void MediaQueryMatcher::mediaFeaturesChanged()
         return;
 
     WillBeHeapVector<RefPtrWillBeMember<MediaQueryListListener> > listenersToNotify;
-    for (MediaQueryListSet::iterator it = m_mediaLists.begin(); it != m_mediaLists.end(); ++it)
-        (*it)->mediaFeaturesChanged(&listenersToNotify);
+    for (MediaQueryListSet::iterator it = m_mediaLists.begin(); it != m_mediaLists.end(); ++it) {
+        if ((*it)->mediaFeaturesChanged(&listenersToNotify)) {
+            RefPtrWillBeRawPtr<Event> event(MediaQueryListEvent::create((*it)->media(), (*it)->matches()));
+            event->setTarget(*it);
+            m_document->enqueuePerFrameEvent(event);
+        }
+    }
 
     m_document->enqueueMediaQueryChangeListeners(listenersToNotify);
 }