Add video-rendering to mojo media pipeline.

media/base/video_renderer.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_BASE_VIDEO_RENDERER_H_
 #define MEDIA_BASE_VIDEO_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 24 matching lines @@
   // completion. If initialization fails, only |init_cb| (not |error_cb|) will
   // be called.
   //
   // |cdm_context| can be used to handle encrypted streams. May be null if the
   // stream is not encrypted.
   //
   // |statistics_cb| is executed periodically with video rendering stats, such
   // as dropped frames.
   //
   // |buffering_state_cb| is executed when video rendering has either run out of
   // data or has enough data to continue playback.

[xhwang, 2016/04/12 19:40:37]

ditto about comment

[alokp, 2016/04/19 00:16:07]

Done.

   //
   // |ended_cb| is executed when video rendering has reached the end of stream.
   //
   // |error_cb| is executed if an error was encountered after initialization.
   //
   // |wall_clock_time_cb| is used to convert media timestamps into wallclock
   // timestamps.
   //
   // |waiting_for_decryption_key_cb| is executed whenever the key needed to
   // decrypt the stream is not available.
   virtual void Initialize(
       DemuxerStream* stream,
       const PipelineStatusCB& init_cb,
       CdmContext* cdm_context,
       const StatisticsCB& statistics_cb,
       const BufferingStateCB& buffering_state_cb,
+      const NaturalSizeChangedCB& natural_size_changed_cb,
       const base::Closure& ended_cb,
       const PipelineStatusCB& error_cb,
       const TimeSource::WallClockTimeCB& wall_clock_time_cb,
       const base::Closure& waiting_for_decryption_key_cb) = 0;
 
   // Discards any video data and stops reading from |stream|, executing
   // |callback| when completed.
   //
   // Clients should expect |buffering_state_cb| to be called with
   // BUFFERING_HAVE_NOTHING while flushing is in progress.
@@ skipping 10 matching lines @@
   // |time_progressing| will be false.
   virtual void OnTimeStateChanged(bool time_progressing) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoRenderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_RENDERER_H_