Rework MediaQueryMatcher to batch up listener notification

Source/core/css/MediaQueryListListener.h

Index: Source/core/css/MediaQueryListListener.h
diff --git a/Source/core/css/MediaQueryListListener.h b/Source/core/css/MediaQueryListListener.h
index 259aaeaa575b33525df773366249d9708b7e71ae..d9299b0b3d650dd345c4febcb4dc8022ea23a282 100644
--- a/Source/core/css/MediaQueryListListener.h
+++ b/Source/core/css/MediaQueryListListener.h
@@ -39,17 +39,23 @@ public:
             return nullptr;
         return adoptRefWillBeNoop(new MediaQueryListListener(scriptState, value));
     }
-    void queryChanged(MediaQueryList*);
+    void call();
+
+    // Used to keep the MediaQueryList alive and registered with the MediaQueryMatcher
+    // as long as the listener exists.
+    void setMediaQueryList(MediaQueryList* query) { m_query = query; }
+    void clearMediaQueryList() { m_query = nullptr; }
 
     bool operator==(const MediaQueryListListener& other) const { return m_function == other.m_function; }
 
-    void trace(Visitor*) { }
+    void trace(Visitor* visitor) { visitor->trace(m_query); }
 
 private:
     MediaQueryListListener(ScriptState*, const ScriptValue&);
 
     RefPtr<ScriptState> m_scriptState;
     ScriptValue m_function;
+    RefPtrWillBeMember<MediaQueryList> m_query;
 };
 
 }