Register MediaPlayerRenderer service

media/base/pipeline_metadata.h

Index: media/base/pipeline_metadata.h
diff --git a/media/base/pipeline_metadata.h b/media/base/pipeline_metadata.h
index d3030efdc80fa1e3254c59808288733114487f2c..52d037a8a60f3c4c5293eec54bf0fbf5b5700ebe 100644
--- a/media/base/pipeline_metadata.h
+++ b/media/base/pipeline_metadata.h
@@ -22,6 +22,10 @@ struct MEDIA_EXPORT PipelineMetadata {
   // 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;