Add video-rendering to mojo media pipeline.

media/base/renderer.h

 // Copyright 2014 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_RENDERER_H_
 #define MEDIA_BASE_RENDERER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 17 matching lines @@
 
   // Initializes the Renderer with |demuxer_stream_provider|, executing
   // |init_cb| upon completion.  If initialization fails, only |init_cb| (not
   // |error_cb|) should be called.  |demuxer_stream_provider| must be valid for
   // the lifetime of the Renderer object.  |init_cb| must only be run after this
   // method has returned.  Firing |init_cb| may result in the immediate
   // destruction of the caller, so it must be run only prior to returning.
   //
   // Permanent callbacks:
   // - |statistics_cb|: Executed periodically with rendering statistics.
   // - |buffering_state_cb|: Executed when buffering state is changed.

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

Add comment for the new callback

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

Done.

   // - |ended_cb|: Executed when rendering has reached the end of stream.
   // - |error_cb|: Executed if any error was encountered after initialization.
   // - |waiting_for_decryption_key_cb|: Executed whenever the key needed to
   //                                    decrypt the stream is not available.
   virtual void Initialize(
       DemuxerStreamProvider* demuxer_stream_provider,
       const PipelineStatusCB& init_cb,
       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 base::Closure& waiting_for_decryption_key_cb) = 0;
 
   // Associates the |cdm_context| with this Renderer for decryption (and
   // decoding) of media data, then fires |cdm_attached_cb| with the result.
   virtual void SetCdm(CdmContext* cdm_context,
                       const CdmAttachedCB& cdm_attached_cb) = 0;
 
   // The following functions must be called after Initialize().
@@ skipping 19 matching lines @@
   // Returns whether |this| renders video.
   virtual bool HasVideo() = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Renderer);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_RENDERER_H_