Oilpan: Use transition types for HTMLMediaElement and make AudioSourceProviderClient a GC mixin.

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 62 matching lines @@
 class HTMLMediaElement : public HTMLElement, public WillBeHeapSupplementable<HTMLMediaElement>, public MediaPlayerClient, public ActiveDOMObject
 {
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElement);
 public:
     static blink::WebMimeRegistry::SupportsType supportsType(const ContentType&, const String& keySystem = String());
 
     static void setMediaStreamRegistry(URLRegistry*);
     static bool isMediaStreamURL(const String& url);
 
     virtual void trace(Visitor*) OVERRIDE;
+#if ENABLE(WEB_AUDIO)
+    void clearWeakMembers(Visitor*);
+#endif
 
     // Do not use player().
     // FIXME: Replace all uses with webMediaPlayer() and remove this API.
     MediaPlayer* player() const { return m_player.get(); }
     blink::WebMediaPlayer* webMediaPlayer() const { return m_player ? m_player->webMediaPlayer() : 0; }
 
     virtual bool hasVideo() const { return false; }
     bool hasAudio() const;
 
     bool supportsSave() const;
@@ skipping 267 matching lines @@
     void selectMediaResource();
     void loadResource(const KURL&, ContentType&, const String& keySystem);
     void startPlayerLoad();
     void setPlayerPreload();
     void startDelayedLoad();
     blink::WebMediaPlayer::LoadType loadType() const;
     void scheduleNextSourceChild();
     void loadNextSourceChild();
     void userCancelledLoad();
     void clearMediaPlayer(int flags);
-    void clearMediaPlayerAndAudioSourceProviderClient();
+    void clearMediaPlayerAndAudioSourceProviderClientWithoutLocking();
     bool havePotentialSourceChild();
     void noneSupported();
     void mediaEngineError(PassRefPtrWillBeRawPtr<MediaError>);
     void cancelPendingEventsAndCallbacks();
     void waitForSourceChange();
     void prepareToPlay();
 
     KURL selectNextSourceChild(ContentType*, String* keySystem, InvalidURLAction);
 
     void mediaLoadingFailed(MediaPlayer::NetworkState);
@@ skipping 132 matching lines @@
     RefPtrWillBeMember<TextTrackList> m_textTracks;
     WillBeHeapVector<RefPtrWillBeMember<TextTrack> > m_textTracksWhenResourceSelectionBegan;
 
     CueIntervalTree m_cueTree;
 
     CueList m_currentlyActiveCues;
     int m_ignoreTrackDisplayUpdate;
 
 #if ENABLE(WEB_AUDIO)
     // This is a weak reference, since m_audioSourceNode holds a reference to us.
-    AudioSourceProviderClient* m_audioSourceNode;
+    // FIXME: Oilpan: Consider making this a strongly traced pointer with oilpan where strong cycles are not a problem.
+    RawPtrWillBeWeakMember<AudioSourceProviderClient> m_audioSourceNode;
 #endif
 
     friend class MediaController;
     RefPtrWillBeMember<MediaController> m_mediaController;
 
     friend class Internals;
     friend class TrackDisplayUpdateScope;
 
     static URLRegistry* s_mediaStreamRegistry;
 };
@@ skipping 25 matching lines @@
 inline bool isHTMLMediaElement(const HTMLElement& element)
 {
     return isHTMLAudioElement(element) || isHTMLVideoElement(element);
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLMediaElement);
 
 } //namespace
 
 #endif