Convert Filter::Seek() to use new callback system.

media/filters/video_renderer_base.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // VideoRendererBase creates its own thread for the sole purpose of timing frame
 // presentation.  It handles reading from the decoder and stores the results in
 // a queue of decoded frames, calling OnFrameAvailable() on subclasses to notify
 // when a frame is ready to display.
 //
 // The media filter methods Initialize(), Stop(), SetPlaybackRate() and Seek()
@@ skipping 33 matching lines @@
       VideoFrame::SurfaceType* surface_type_out,
       VideoFrame::Format* surface_format_out,
       int* width_out, int* height_out);
 
   // Filter implementation.
   virtual void Play(FilterCallback* callback);
   virtual void Pause(FilterCallback* callback);
   virtual void Flush(FilterCallback* callback);
   virtual void Stop(FilterCallback* callback);
   virtual void SetPlaybackRate(float playback_rate);
-  virtual void Seek(base::TimeDelta time, FilterCallback* callback);
+  virtual void Seek(base::TimeDelta time, const FilterStatusCB& cb);
 
   // VideoRenderer implementation.
   virtual void Initialize(VideoDecoder* decoder,
                           FilterCallback* callback,
                           StatisticsCallback* stats_callback);
   virtual bool HasEnded();
 
   // PlatformThread::Delegate implementation.
   virtual void ThreadMain();
 
@@ skipping 141 matching lines @@
   // decoder provides buffer, |pending_reads_| is always non-positive and if
   // renderer provides buffer, |pending_reads_| is always non-negative.
   int pending_reads_;
   bool pending_paint_;
   bool pending_paint_with_last_available_;
 
   float playback_rate_;
 
   // Filter callbacks.
   scoped_ptr<FilterCallback> flush_callback_;
-  scoped_ptr<FilterCallback> seek_callback_;
+  FilterStatusCB seek_cb_;
   scoped_ptr<StatisticsCallback> statistics_callback_;
 
   base::TimeDelta seek_timestamp_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_VIDEO_RENDERER_BASE_H_