Oilpan: have the media element safely close its MediaSource.

Source/modules/mediasource/MediaSource.h

 /*
  * Copyright (C) 2013 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 69 matching lines @@
     void endOfStream(ExceptionState&);
     static bool isTypeSupported(const String& type);
 
         // HTMLMediaSource
     virtual bool attachToElement(HTMLMediaElement*) OVERRIDE;
     virtual void setWebMediaSourceAndOpen(PassOwnPtr<blink::WebMediaSource>) OVERRIDE;
     virtual void close() OVERRIDE;
     virtual bool isClosed() const OVERRIDE;
     virtual double duration() const OVERRIDE;
     virtual PassRefPtr<TimeRanges> buffered() const OVERRIDE;
+#if !ENABLE(OILPAN)
     virtual void refHTMLMediaSource() OVERRIDE { ref(); }
     virtual void derefHTMLMediaSource() OVERRIDE { deref(); }
+#endif
 
     // EventTarget interface
     virtual const AtomicString& interfaceName() const OVERRIDE;
     virtual ExecutionContext* executionContext() const OVERRIDE;
 
     // ActiveDOMObject interface
     virtual bool hasPendingActivity() const OVERRIDE;
     virtual void stop() OVERRIDE;
 
     // URLRegistrable interface
     virtual URLRegistry& registry() const OVERRIDE;
 
     // Used by SourceBuffer.
     void openIfInEndedState();
     bool isOpen() const;
 
     // Used by MediaSourceRegistry.
     void addedToRegistry();
     void removedFromRegistry();
 
     void trace(Visitor*);
+    void clearWeakMembers(Visitor*);
 
 private:
     explicit MediaSource(ExecutionContext*);
 
     void setReadyState(const AtomicString&);
     void onReadyStateChange(const AtomicString&, const AtomicString&);
 
     bool isUpdating() const;
 
     PassOwnPtr<blink::WebSourceBuffer> createWebSourceBuffer(const String& type, const Vector<String>& codecs, ExceptionState&);
     void scheduleEvent(const AtomicString& eventName);
     void endOfStreamInternal(const blink::WebMediaSource::EndOfStreamStatus, ExceptionState&);
 
     // Implements the duration change algorithm.
     // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#duration-change-algorithm
     void durationChangeAlgorithm(double newDuration);
 
     OwnPtr<blink::WebMediaSource> m_webMediaSource;
     AtomicString m_readyState;
     OwnPtrWillBeMember<GenericEventQueue> m_asyncEventQueue;
-    // FIXME: oilpan: This should become a Member. For now, m_attachedElement will be cleared by the HTMLMediaElement destructor.
-    HTMLMediaElement* m_attachedElement;
+    RawPtrWillBeWeakMember<HTMLMediaElement> m_attachedElement;
 
     Member<SourceBufferList> m_sourceBuffers;
     Member<SourceBufferList> m_activeSourceBuffers;
 };
 
 } // namespace WebCore
 
 #endif