Support (E)AC3 passthrough

chromecast/common/media/cast_media_client.cc

Index: chromecast/common/media/cast_media_client.cc
diff --git a/chromecast/common/media/cast_media_client.cc b/chromecast/common/media/cast_media_client.cc
index 38ba0f14bc7f8dc1017c511294033950c6283ceb..ae57816b99efb8f6aea994e8d52d017f466a0b99 100644
--- a/chromecast/common/media/cast_media_client.cc
+++ b/chromecast/common/media/cast_media_client.cc
@@ -5,6 +5,7 @@
 #include "chromecast/common/media/cast_media_client.h"
 
 #include "base/lazy_instance.h"
+#include "chromecast/media/base/media_caps.h"
 #include "chromecast/media/base/media_codec_support.h"
 #include "chromecast/public/media/media_capabilities_shlib.h"
 
@@ -55,7 +56,6 @@ void CastMediaClient::RecordRapporURL(const std::string& metric,
   content_media_client_->RecordRapporURL(metric, url);
 }
 
-// static
 bool CastMediaClient::IsSupportedVideoConfig(::media::VideoCodec codec,
                                              ::media::VideoCodecProfile profile,
                                              int level) {
@@ -75,5 +75,12 @@ bool CastMediaClient::IsSupportedVideoConfig(::media::VideoCodec codec,
   return true;
 }
 
+bool CastMediaClient::IsSupportedPassthroughAudio(::media::AudioCodec codec) {
+  return (codec == ::media::kCodecAC3 &&
+          MediaCapabilities::HdmiSinkSupportsAC3()) ||
+         (codec == ::media::kCodecEAC3 &&
+          MediaCapabilities::HdmiSinkSupportsEAC3());
+}
+
 }  // namespace media
 }  // namespace chromecast