Using AudioOption to enable audio network adaptor.

webrtc/media/base/mediachannel.h

Index: webrtc/media/base/mediachannel.h
diff --git a/webrtc/media/base/mediachannel.h b/webrtc/media/base/mediachannel.h
index b71a309233546f941150431bf5df4aca8f46b095..a375d00a6215b745096589a4f8bf7d658a5a6f50 100644
--- a/webrtc/media/base/mediachannel.h
+++ b/webrtc/media/base/mediachannel.h
@@ -166,6 +166,7 @@ struct AudioOptions {
     SetFrom(&recording_sample_rate, change.recording_sample_rate);
     SetFrom(&playout_sample_rate, change.playout_sample_rate);
     SetFrom(&combined_audio_video_bwe, change.combined_audio_video_bwe);
+    SetFrom(&audio_network_adaptor_config, change.audio_network_adaptor_config);
   }
 
   bool operator==(const AudioOptions& o) const {
@@ -193,7 +194,8 @@ struct AudioOptions {
            tx_agc_limiter == o.tx_agc_limiter &&
            recording_sample_rate == o.recording_sample_rate &&
            playout_sample_rate == o.playout_sample_rate &&
-           combined_audio_video_bwe == o.combined_audio_video_bwe;
+           combined_audio_video_bwe == o.combined_audio_video_bwe &&
+           audio_network_adaptor_config == o.audio_network_adaptor_config;
   }
   bool operator!=(const AudioOptions& o) const { return !(*this == o); }
 
@@ -225,6 +227,8 @@ struct AudioOptions {
     ost << ToStringIfSet("recording_sample_rate", recording_sample_rate);
     ost << ToStringIfSet("playout_sample_rate", playout_sample_rate);
     ost << ToStringIfSet("combined_audio_video_bwe", combined_audio_video_bwe);
+    ost << ToStringIfSet("audio_network_adaptor_config",
+                         audio_network_adaptor_config);
     ost << "}";
     return ost.str();
   }
@@ -265,6 +269,8 @@ struct AudioOptions {
   // "googCombinedAudioVideoBwe", but not used anywhere. So delete it,
   // and check if any other AudioOptions members are unused.
   rtc::Optional<bool> combined_audio_video_bwe;
+  // Enable and config string for audio network adaptor.
+  rtc::Optional<std::string> audio_network_adaptor_config;
 
  private:
   template <typename T>