Oilpan: add prefinalizer for HTMLMediaElement.

Source/core/html/HTMLMediaElement.h

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 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 54 matching lines @@
 class URLRegistry;
 class VideoTrackList;
 
 // FIXME: The inheritance from MediaPlayerClient here should be private inheritance.
 // But it can't be until the Chromium WebMediaPlayerClientImpl class is fixed so it
 // no longer depends on typecasting a MediaPlayerClient to an HTMLMediaElement.
 
 class CORE_EXPORT HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public MediaPlayerClient, public ActiveDOMObject {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElement);
+    WILL_BE_USING_PRE_FINALIZER(HTMLMediaElement, dispose);
 public:
     static WebMimeRegistry::SupportsType supportsType(const ContentType&, const String& keySystem = String());
 
     static void setMediaStreamRegistry(URLRegistry*);
     static bool isMediaStreamURL(const String& url);
 
     DECLARE_VIRTUAL_TRACE();
 #if ENABLE(WEB_AUDIO)
     void clearWeakMembers(Visitor*);
 #endif
@@ skipping 196 matching lines @@
     void setCloseMediaSourceWhenFinalizing();
 #endif
 
     // Predicates also used when dispatching wrapper creation (cf. [SpecialWrapFor] IDL attribute usage.)
     virtual bool isHTMLAudioElement() const { return false; }
     virtual bool isHTMLVideoElement() const { return false; }
 
 protected:
     HTMLMediaElement(const QualifiedName&, Document&);
     virtual ~HTMLMediaElement();
+#if ENABLE(OILPAN)
+    void dispose();
+#endif
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) override;
     virtual void finishParsingChildren() override final;
     virtual bool isURLAttribute(const Attribute&) const override;
     virtual void attach(const AttachContext& = AttachContext()) override;
 
     virtual void didMoveToNewDocument(Document& oldDocument) override;
 
     enum DisplayMode { Unknown, Poster, Video };
     DisplayMode displayMode() const { return m_displayMode; }
@@ skipping 285 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } // namespace blink
 
 #endif // HTMLMediaElement_h