Now pass ADM as a constructor argument to audio_state.

webrtc/audio/audio_state.h

Index: webrtc/audio/audio_state.h
diff --git a/webrtc/audio/audio_state.h b/webrtc/audio/audio_state.h
index 31892d04faaa5141b9e25d9486553da4ce101b11..eacb4bd97507df3e3e2342c9d2cce6251d35e94f 100644
--- a/webrtc/audio/audio_state.h
+++ b/webrtc/audio/audio_state.h
@@ -24,10 +24,12 @@ namespace internal {
 class AudioState final : public webrtc::AudioState,
                          public webrtc::VoiceEngineObserver {
  public:
-  explicit AudioState(const AudioState::Config& config);
+  explicit AudioState(const AudioState::Config& config,
+                      webrtc::AudioDeviceModule* adm);
   ~AudioState() override;
 
   VoiceEngine* voice_engine();
+  AudioDeviceModule* audio_device();
   bool typing_noise_detected() const;
 
  private:
@@ -53,6 +55,8 @@ class AudioState final : public webrtc::AudioState,
   // Reference count; implementation copied from rtc::RefCountedObject.
   mutable volatile int ref_count_ = 0;
 
+  rtc::scoped_refptr<AudioDeviceModule> adm_;
+
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(AudioState);
 };
 }  // namespace internal