Injectable audio encoders: WebRtcVoiceEngine and company

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index b5e1cad73b62c767e949f2b08821410ec617f384..b8a6028b8866f109ff1ac09959d50ef1b31af3ae 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -1306,6 +1306,11 @@ bool Channel::SetEncoder(int payload_type,
   return true;
 }
 
+void Channel::ModifyEncoder(
+    rtc::FunctionView<void(std::unique_ptr<AudioEncoder>*)> modifier) {
+  audio_coding_->ModifyEncoder(modifier);
+}
+
 int32_t Channel::RegisterVoiceEngineObserver(VoiceEngineObserver& observer) {
   WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, _channelId),
                "Channel::RegisterVoiceEngineObserver()");