Expose the poster image URL to WebMediaPlayer subclasses

Source/platform/graphics/media/MediaPlayer.h

Index: Source/platform/graphics/media/MediaPlayer.h
diff --git a/Source/platform/graphics/media/MediaPlayer.h b/Source/platform/graphics/media/MediaPlayer.h
index c63379b554d94a301bc50042f37a27998fa8dd8b..f7bae3a83100ce47ac2c53f592449581a7115a58 100644
--- a/Source/platform/graphics/media/MediaPlayer.h
+++ b/Source/platform/graphics/media/MediaPlayer.h
@@ -82,6 +82,10 @@ public:
 
     virtual void mediaPlayerRequestSeek(double) = 0;
 
+    // The URL for video poster image.
+    // FIXME: Remove this when WebMediaPlayerClientImpl::loadInternal does not depend on it.
+    virtual KURL mediaPlayerPosterURL() = 0;
+
 // Presentation-related methods
     // a new frame of video is available
     virtual void mediaPlayerRepaint() = 0;
@@ -148,6 +152,8 @@ public:
     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;