Register MediaPlayerRenderer service

media/base/pipeline_metadata.h

 // Copyright 2016 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_PIPELINE_METADATA_H_
 #define MEDIA_BASE_PIPELINE_METADATA_H_
 
 #include "base/time/time.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/video_decoder_config.h"
 #include "media/base/video_rotation.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 // Metadata describing a pipeline once it has been initialized.
 struct MEDIA_EXPORT PipelineMetadata {
   PipelineMetadata();
   ~PipelineMetadata();
 
   // Required by Chromium style: Complex class/struct needs an explicit
   // out-of-line copy constructor.
   PipelineMetadata(const PipelineMetadata&);
 
+  // On Android, when using the MediaPlayerRenderer, |has_video| and |has_audio|
+  // will be true, but the respective configs will be empty.
+  // Do not make any assumptions on the validity of configs based off of the
+  // presence of audio/video.
   bool has_audio;
   bool has_video;
   AudioDecoderConfig audio_decoder_config;
   VideoDecoderConfig video_decoder_config;
   gfx::Size natural_size;
   VideoRotation video_rotation;
   base::Time timeline_offset;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_PIPELINE_METADATA_H_