Expose the poster image URL to WebMediaPlayer subclasses

Source/platform/graphics/media/MediaPlayer.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 130 matching lines @@
     virtual bool seeking() const = 0;
 
     virtual double rate() const = 0;
     virtual void setRate(double) = 0;
 
     virtual bool paused() const = 0;
 
     virtual void setVolume(double) = 0;
     virtual void setMuted(bool) = 0;
 
+    virtual void setPoster(const KURL&) = 0;
+
     enum NetworkState { Empty, Idle, Loading, Loaded, FormatError, NetworkError, DecodeError };
     virtual NetworkState networkState() const = 0;
 
     enum ReadyState  { HaveNothing, HaveMetadata, HaveCurrentData, HaveFutureData, HaveEnoughData };
     virtual ReadyState readyState() const = 0;
 
     virtual double maxTimeSeekable() const = 0;
     virtual PassRefPtr<TimeRanges> buffered() const = 0;
 
     virtual bool didLoadingProgress() const = 0;
@@ skipping 29 matching lines @@
     enum MediaKeyException { NoError, InvalidPlayerState, KeySystemNotSupported, InvalidAccess };
     virtual MediaKeyException addKey(const String&, const unsigned char*, unsigned, const unsigned char*, unsigned, const String&) = 0;
     virtual MediaKeyException generateKeyRequest(const String&, const unsigned char*, unsigned) = 0;
     virtual MediaKeyException cancelKeyRequest(const String&, const String&) = 0;
     virtual void setContentDecryptionModule(blink::WebContentDecryptionModule*) = 0;
 };
 
 }
 
 #endif // MediaPlayer_h