[oilpan] The Node hierarchy should have correct accept method chains

Source/core/html/HTMLVideoElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 50 matching lines @@
     void paintCurrentFrameInContext(GraphicsContext*, const IntRect&);
 
     // Used by WebGL to do GPU-GPU textures copy if possible.
     // See more details at MediaPlayer::copyVideoTextureToPlatformTexture() defined in Source/WebCore/platform/graphics/MediaPlayer.h.
     bool copyVideoTextureToPlatformTexture(GraphicsContext3D*, Platform3DObject texture, GC3Dint level, GC3Denum type, GC3Denum internalFormat, bool premultiplyAlpha, bool flipY);
 
     bool shouldDisplayPosterImage() const { return displayMode() == Poster || displayMode() == PosterWaitingForVideo; }
 
     KURL posterImageURL() const;
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     HTMLVideoElement(const QualifiedName&, Handle<Document>, bool);
 
     virtual bool rendererIsNeeded(const NodeRenderingContext&);
     virtual RenderObject* createRenderer(RenderArena*, RenderStyle*);
     virtual void attach();
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, Handle<MutableStylePropertySet>) OVERRIDE;
     virtual bool isVideo() const { return true; }
     virtual bool hasVideo() const { return player() && player()->hasVideo(); }
     virtual bool supportsFullscreen() const;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
     virtual const AtomicString& imageSourceURL() const OVERRIDE;
 
     virtual bool hasAvailableVideoFrame() const;
     virtual void updateDisplayState();
     virtual void didMoveToNewDocument(Handle<Document> oldDocument) OVERRIDE;
     virtual void setDisplayMode(DisplayMode);
 
     OwnPtr<HTMLImageLoader> m_imageLoader;
 
     AtomicString m_defaultPosterURL;
 };
 
 } //namespace
 
 #endif