Expose the poster image URL to WebMediaPlayer subclasses

Source/core/html/HTMLVideoElement.cpp

 /*
  * 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 95 matching lines @@
         HTMLMediaElement::setDisplayMode(Unknown);
         updateDisplayState();
         if (shouldDisplayPosterImage()) {
             if (!m_imageLoader)
                 m_imageLoader = adoptPtr(new HTMLImageLoader(this));
             m_imageLoader->updateFromElementIgnoringPreviousError();
         } else {
             if (renderer())
                 toRenderImage(renderer())->imageResource()->setImageResource(0);
         }
+        // Notify the player when the poster image URL changes.
+        if (player())
+            player()->setPoster(posterImageURL());
     } else
         HTMLMediaElement::parseAttribute(name, value);
 }
 
 bool HTMLVideoElement::supportsFullscreen() const
 {
     if (!document().page())
         return false;
 
     if (!player())
@@ skipping 138 matching lines @@
 
 KURL HTMLVideoElement::posterImageURL() const
 {
     String url = stripLeadingAndTrailingHTMLSpaces(imageSourceURL());
     if (url.isEmpty())
         return KURL();
     return document().completeURL(url);
 }
 
 }