Add IsSupportedBitstreamAudioCodec() function in MediaClient.

chromecast/renderer/cast_content_renderer_client.cc

Index: chromecast/renderer/cast_content_renderer_client.cc
diff --git a/chromecast/renderer/cast_content_renderer_client.cc b/chromecast/renderer/cast_content_renderer_client.cc
index ba3f58c4f7f0879d84a540cd04baf8bbd21a7b24..78f20a0d0528f502f390e4f48bcd0f3132eac552 100644
--- a/chromecast/renderer/cast_content_renderer_client.cc
+++ b/chromecast/renderer/cast_content_renderer_client.cc
@@ -166,6 +166,14 @@ bool CastContentRendererClient::IsSupportedVideoConfig(
 #endif
 }
 
+bool CastContentRendererClient::IsSupportedBitstreamAudioCodec(
+    ::media::AudioCodec codec) {
+  return (codec == ::media::kCodecAC3 &&
+          media::MediaCapabilities::HdmiSinkSupportsAC3()) ||
+         (codec == ::media::kCodecEAC3 &&
+          media::MediaCapabilities::HdmiSinkSupportsEAC3());
+}
+
 blink::WebPrescientNetworking*
 CastContentRendererClient::GetPrescientNetworking() {
   return prescient_networking_dispatcher_.get();