Support for two audio codec lists down into WebRtcVoiceEngine.

webrtc/media/engine/webrtcvoiceengine.cc

Index: webrtc/media/engine/webrtcvoiceengine.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine.cc b/webrtc/media/engine/webrtcvoiceengine.cc
index 47ed43e82efa6fe6add97738d6fe45a97015914e..2575c9f12b8ff9db2b6ae4e9940d2eaa374d8aea 100644
--- a/webrtc/media/engine/webrtcvoiceengine.cc
+++ b/webrtc/media/engine/webrtcvoiceengine.cc
@@ -926,7 +926,12 @@ int WebRtcVoiceEngine::GetInputLevel() {
       static_cast<int>(ulevel) : -1;
 }
 
-const std::vector<AudioCodec>& WebRtcVoiceEngine::codecs() {
+const std::vector<AudioCodec>& WebRtcVoiceEngine::send_codecs() const {
+  RTC_DCHECK(signal_thread_checker_.CalledOnValidThread());
+  return codecs_;
+}
+
+const std::vector<AudioCodec>& WebRtcVoiceEngine::recv_codecs() const {
   RTC_DCHECK(signal_thread_checker_.CalledOnValidThread());
   return codecs_;
 }