Implement MojoAudioRendererSink and use it in UtilityMojoMediaClient

media/mojo/common/media_type_converters.h

Index: media/mojo/common/media_type_converters.h
diff --git a/media/mojo/common/media_type_converters.h b/media/mojo/common/media_type_converters.h
index d0afe7060aba25957eceec67080fbdf1060cb4a3..5ac927033041fcbb82531e6256353108288e370a 100644
--- a/media/mojo/common/media_type_converters.h
+++ b/media/mojo/common/media_type_converters.h
@@ -14,6 +14,7 @@
 
 namespace media {
 class AudioBuffer;
+class AudioBus;
 class AudioDecoderConfig;
 class DecoderBuffer;
 class DecryptConfig;
@@ -128,6 +129,11 @@ struct TypeConverter<scoped_refptr<media::AudioBuffer>,
 };
 
 template <>
+struct TypeConverter<media::mojom::AudioBusPtr, media::AudioBus> {
+  static media::mojom::AudioBusPtr Convert(const media::AudioBus& input);
+};
+
+template <>
 struct TypeConverter<media::mojom::VideoFramePtr,
                      scoped_refptr<media::VideoFrame>> {
   static media::mojom::VideoFramePtr Convert(