Make the MediaQueryList listener an EventListener

Source/core/css/MediaQueryListEvent.h

Index: Source/core/css/MediaQueryListEvent.h
diff --git a/Source/core/css/MediaQueryListEvent.h b/Source/core/css/MediaQueryListEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..708458e525f488e2a87417e0fb741d2fd4a20356
--- /dev/null
+++ b/Source/core/css/MediaQueryListEvent.h
@@ -0,0 +1,93 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MediaQueryListEvent_h
+#define MediaQueryListEvent_h
+
+#include "core/css/MediaQueryList.h"
+#include "core/events/Event.h"
+
+namespace blink {
+
+struct MediaQueryListEventInit : public EventInit {
+    MediaQueryListEventInit() : matches(false) { }
+
+    String media;
+    bool matches;
+};
+
+class MediaQueryListEvent FINAL : public Event {
+public:
+    static PassRefPtrWillBeRawPtr<MediaQueryListEvent> create()
+    {
+        return adoptRefWillBeNoop(new MediaQueryListEvent);
+    }
+
+    static PassRefPtrWillBeRawPtr<MediaQueryListEvent> create(MediaQueryList* list)
+    {
+        return adoptRefWillBeNoop(new MediaQueryListEvent(list));
+    }
+
+    static PassRefPtrWillBeRawPtr<MediaQueryListEvent> create(const String& media, bool matches)
+    {
+        return adoptRefWillBeNoop(new MediaQueryListEvent(media, matches));
+    }
+
+    static PassRefPtrWillBeRawPtr<MediaQueryListEvent> create(const AtomicString& eventType, const MediaQueryListEventInit& initializer)
+    {
+        return adoptRefWillBeNoop(new MediaQueryListEvent(eventType, initializer));
+    }
+
+    String media() const { return m_mediaQueryList ? m_mediaQueryList->media() : m_media; }
+    bool matches() const { return m_mediaQueryList ? m_mediaQueryList->matches() : m_matches; }
+
+    virtual const AtomicString& interfaceName() const OVERRIDE { return EventNames::MediaQueryListEvent; }
+
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        Event::trace(visitor);
+        visitor->trace(m_mediaQueryList);
+    }
+
+private:
+    MediaQueryListEvent()
+        : m_matches(false)
+    {
+        ScriptWrappable::init(this);
+    }
+
+    MediaQueryListEvent(const String& media, bool matches)
+        : Event(EventTypeNames::change, false, false)
+        , m_media(media)
+        , m_matches(matches)
+    {
+        ScriptWrappable::init(this);
+    }
+
+    explicit MediaQueryListEvent(MediaQueryList* list)
+        : Event(EventTypeNames::change, false, false)
+        , m_mediaQueryList(list)
+        , m_matches(false)
+    {
+        ScriptWrappable::init(this);
+    }
+
+    MediaQueryListEvent(const AtomicString& eventType, const MediaQueryListEventInit& initializer)
+        : Event(eventType, initializer)
+        , m_media(initializer.media)
+        , m_matches(initializer.matches)
+    {
+        ScriptWrappable::init(this);
+    }
+
+    // We have m_media/m_matches for JS-created events; we use m_mediaQueryList
+    // for events that blink generates.
+    RefPtrWillBeMember<MediaQueryList> m_mediaQueryList;
+    String m_media;
+    bool m_matches;
+};
+
+} // namespace blink
+
+#endif // MediaQueryListEvent_h