Oilpan: make MediaError + TrackEvent heap savvier.

Source/core/html/HTMLMediaElement.cpp

 /*
  * 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 538 matching lines @@
     if (m_pendingActionFlags & LoadMediaResource) {
         if (m_loadState == LoadingFromSourceElement)
             loadNextSourceChild();
         else
             loadInternal();
     }
 
     m_pendingActionFlags = 0;
 }
 
-PassRefPtr<MediaError> HTMLMediaElement::error() const
+PassRefPtrWillBeRawPtr<MediaError> HTMLMediaElement::error() const
 {
     return m_error;
 }
 
 void HTMLMediaElement::setSrc(const AtomicString& url)
 {
     setAttribute(srcAttr, url);
 }
 
 HTMLMediaElement::NetworkState HTMLMediaElement::networkState() const
@@ skipping 831 matching lines @@
 
     // 9 - Abort these steps. Until the load() method is invoked or the src attribute is changed,
     // the element won't attempt to load another resource.
 
     updateDisplayState();
 
     if (renderer())
         renderer()->updateFromElement();
 }
 
-void HTMLMediaElement::mediaEngineError(PassRefPtr<MediaError> err)
+void HTMLMediaElement::mediaEngineError(PassRefPtrWillBeRawPtr<MediaError> err)
 {
     WTF_LOG(Media, "HTMLMediaElement::mediaEngineError(%d)", static_cast<int>(err->code()));
 
     // 1 - The user agent should cancel the fetching process.
     stopPeriodicTimers();
     m_loadState = WaitingForSource;
 
     // 2 - Set the error attribute to a new MediaError object whose code attribute is
     // set to MEDIA_ERR_NETWORK/MEDIA_ERR_DECODE.
     m_error = err;
@@ skipping 2180 matching lines @@
     m_mediaSource->setWebMediaSourceAndOpen(adoptPtr(webMediaSource));
 }
 
 bool HTMLMediaElement::isInteractiveContent() const
 {
     return fastHasAttribute(controlsAttr);
 }
 
 void HTMLMediaElement::trace(Visitor* visitor)
 {
+    visitor->trace(m_error);
     visitor->trace(m_currentSourceNode);
     visitor->trace(m_nextChildNodeToConsider);
     visitor->trace(m_textTracks);
     visitor->trace(m_textTracksWhenResourceSelectionBegan);
     WillBeHeapSupplementable<HTMLMediaElement>::trace(visitor);
     HTMLElement::trace(visitor);
 }
 
 }