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

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
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 #ifndef MediaStreamTrack_h
 #define MediaStreamTrack_h
 
+#include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/mediastream/SourceInfo.h"
 #include "platform/mediastream/MediaStreamDescriptor.h"
 #include "platform/mediastream/MediaStreamSource.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class AudioSourceProvider;
 class ExceptionState;
 class MediaStreamComponent;
 class MediaStreamTrackSourcesCallback;
 
 class MODULES_EXPORT MediaStreamTrack
     : public RefCountedGarbageCollectedEventTargetWithInlineData<MediaStreamTrack>
+    , public ActiveScriptWrappable
     , public ActiveDOMObject
     , public MediaStreamSource::Observer {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(MediaStreamTrack);
     USING_GARBAGE_COLLECTED_MIXIN(MediaStreamTrack);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static MediaStreamTrack* create(ExecutionContext*, MediaStreamComponent*);
     ~MediaStreamTrack() override;
 
     String kind() const;
@@ skipping 20 matching lines @@
     MediaStreamComponent* component() { return m_component; }
     bool ended() const;
 
     void registerMediaStream(MediaStream*);
     void unregisterMediaStream(MediaStream*);
 
     // EventTarget
     const AtomicString& interfaceName() const override;
     ExecutionContext* getExecutionContext() const override;
 
+    // ActiveScriptWrappable
+    bool hasPendingActivity() const final;
+
     // ActiveDOMObject
-    bool hasPendingActivity() const override;
     void stop() override;
 
     PassOwnPtr<AudioSourceProvider> createWebAudioSource();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     friend class CanvasCaptureMediaStreamTrack;
 
     MediaStreamTrack(ExecutionContext*, MediaStreamComponent*);
 
     // MediaStreamSourceObserver
     void sourceChangedState() override;
 
     void propagateTrackEnded();
 
     MediaStreamSource::ReadyState m_readyState;
     HeapHashSet<Member<MediaStream>> m_registeredMediaStreams;
     bool m_isIteratingRegisteredMediaStreams;
     bool m_stopped;
     Member<MediaStreamComponent> m_component;
 };
 
 typedef HeapVector<Member<MediaStreamTrack>> MediaStreamTrackVector;
 
 } // namespace blink
 
 #endif // MediaStreamTrack_h