Early initialize recording on the ADM from WebRtcVoiceMediaChannel.

webrtc/media/engine/webrtcvoiceengine.h

Index: webrtc/media/engine/webrtcvoiceengine.h
diff --git a/webrtc/media/engine/webrtcvoiceengine.h b/webrtc/media/engine/webrtcvoiceengine.h
index 247669798416439e8d23b4e223b8c818e7392d80..aca850682b1224ed1c5d51b292589b047f121993 100644
--- a/webrtc/media/engine/webrtcvoiceengine.h
+++ b/webrtc/media/engine/webrtcvoiceengine.h
@@ -103,6 +103,7 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
 
   void StartAecDump(const std::string& filename);
   int CreateVoEChannel();
+  webrtc::AudioDeviceModule* adm();
 
   rtc::ThreadChecker signal_thread_checker_;
   rtc::ThreadChecker worker_thread_checker_;
@@ -126,7 +127,7 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   rtc::Optional<bool> delay_agnostic_aec_;
   rtc::Optional<bool> experimental_ns_;
 
-  RTC_DISALLOW_COPY_AND_ASSIGN(WebRtcVoiceEngine);
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(WebRtcVoiceEngine);
 };
 
 // WebRtcVoiceMediaChannel is an implementation of VoiceMediaChannel that uses
@@ -225,6 +226,7 @@ class WebRtcVoiceMediaChannel final : public VoiceMediaChannel,
   bool HasSendCodec() const {
     return send_codec_spec_.codec_inst.pltype != -1;
   }
+  void SetupRecording();
 
   rtc::ThreadChecker worker_thread_checker_;