[Chromecast] Introduce a MediaCapabilitiesShlib::IsSupportedAudioConfig

chromecast/media/cma/backend/cast_media_dummy.cc

Index: chromecast/media/cma/backend/cast_media_dummy.cc
diff --git a/chromecast/media/cma/backend/cast_media_dummy.cc b/chromecast/media/cma/backend/cast_media_dummy.cc
index e8996dca0356264badc67b11546a89689e32a467..b889a0fc9cc00d23c7aef2b44048a83f67f9c1e9 100644
--- a/chromecast/media/cma/backend/cast_media_dummy.cc
+++ b/chromecast/media/cma/backend/cast_media_dummy.cc
@@ -52,5 +52,10 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return (codec == kCodecH264 || codec == kCodecVP8);
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  return config.codec == kCodecAAC || config.codec == kCodecMP3 ||
+         config.codec == kCodecPCM;
+}
+
 }  // namespace media
 }  // namespace chromecast