[Chromecast] Introduce a MediaCapabilitiesShlib::IsSupportedAudioConfig

chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc

Index: chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc
diff --git a/chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc b/chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc
index 46dc0de54a92ee57056c7f97a8a6dc9f45362cc5..0b9c8c9f1b36d3404036e261819f86bf3df171dd 100644
--- a/chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc
+++ b/chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc
@@ -40,5 +40,10 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return (codec == kCodecH264 || codec == kCodecVP8 || codec == kCodecVP9);
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  return config.codec == kCodecAAC || config.codec == kCodecMP3 ||
+         config.codec == kCodecPCM;
+}
+
 }  // namespace media
 }  // namespace chromecast