[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/core/css/MediaQueryList.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  Library General Public License for more details.
  *
  *  You should have received a copy of the GNU Library General Public License
  *  along with this library; see the file COPYING.LIB.  If not, write to
  *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  *  Boston, MA 02110-1301, USA.
  */
 
 #ifndef MediaQueryList_h
 #define MediaQueryList_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventTarget.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ExecutionContext;
 class MediaQueryListListener;
 class MediaQueryMatcher;
 class MediaQuerySet;
 
 // MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
 // The objects of this class are returned by window.matchMedia. They may be used to
 // retrieve the current value of the given media query and to add/remove listeners that
 // will be called whenever the value of the query changes.
 
-class CORE_EXPORT MediaQueryList final : public EventTargetWithInlineData, public RefCountedWillBeNoBase<MediaQueryList>, public ActiveDOMObject {
+class CORE_EXPORT MediaQueryList final : public EventTargetWithInlineData, public RefCountedWillBeNoBase<MediaQueryList>, public ActiveScriptWrappable, public ActiveDOMObject {
     REFCOUNTED_EVENT_TARGET(MediaQueryList);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MediaQueryList);
 public:
     static PassRefPtrWillBeRawPtr<MediaQueryList> create(ExecutionContext*, PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
     ~MediaQueryList() override;
 
     String media() const;
     bool matches();
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
 
     // These two functions are provided for compatibility with JS code
     // written before the change listener became a DOM event.
     void addDeprecatedListener(PassRefPtrWillBeRawPtr<EventListener>);
     void removeDeprecatedListener(PassRefPtrWillBeRawPtr<EventListener>);
 
     // C++ code can use these functions to listen to changes instead of having to use DOM event listeners.
     void addListener(PassRefPtrWillBeRawPtr<MediaQueryListListener>);
     void removeListener(PassRefPtrWillBeRawPtr<MediaQueryListListener>);
 
     // Will return true if a DOM event should be scheduled.
     bool mediaFeaturesChanged(WillBeHeapVector<RefPtrWillBeMember<MediaQueryListListener>>* listenersToNotify);
 
     DECLARE_VIRTUAL_TRACE();
 
+    // From ActiveScriptWrappable
+    bool hasPendingActivity() const final;
+
     // From ActiveDOMObject
-    bool hasPendingActivity() const override;
     void stop() override;
 
     const AtomicString& interfaceName() const override;
     ExecutionContext* getExecutionContext() const override;
 
 private:
     MediaQueryList(ExecutionContext*, PassRefPtrWillBeRawPtr<MediaQueryMatcher>, PassRefPtrWillBeRawPtr<MediaQuerySet>);
 
     bool updateMatches();
 
     RefPtrWillBeMember<MediaQueryMatcher> m_matcher;
     RefPtrWillBeMember<MediaQuerySet> m_media;
     using ListenerList = WillBeHeapListHashSet<RefPtrWillBeMember<MediaQueryListListener>>;
     ListenerList m_listeners;
     bool m_matchesDirty;
     bool m_matches;
 };
 
 } // namespace blink
 
 #endif // MediaQueryList_h