Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h

Index: webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h
diff --git a/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h b/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h
index bb8faf45d85ce0f427125edfdfae7d58eac483de..1bf2ce791bb6012fefeec6aae0b7c65e2a8e0314 100644
--- a/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h
+++ b/webrtc/modules/audio_coding/audio_network_adaptor/dtx_controller.h
@@ -31,12 +31,16 @@ class DtxController final : public Controller {
 
   explicit DtxController(const Config& config);
 
-  void MakeDecision(const NetworkMetrics& metrics,
-                    AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
+  ~DtxController() override;
+
+  void UpdateNetworkMetrics(const NetworkMetrics& network_metrics) override;
+
+  void MakeDecision(AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
 
  private:
   const Config config_;
   bool dtx_enabled_;
+  rtc::Optional<int> uplink_bandwidth_bps_;
   RTC_DISALLOW_COPY_AND_ASSIGN(DtxController);
 };