Instantly pass network changes to controllers in audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 10 matching lines @@
  public:
   struct Config {
     Config(int initial_bitrate_bps, int initial_frame_length_ms);
     ~Config();
     int initial_bitrate_bps;
     int initial_frame_length_ms;
   };
 
   explicit BitrateController(const Config& config);
 
-  void MakeDecision(const NetworkMetrics& metrics,
-                    AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
+  ~BitrateController() override;
+
+  void UpdateNetworkMetrics(const NetworkMetrics& network_metrics) override;
+
+  void MakeDecision(AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
 
  private:
   const Config config_;
   int bitrate_bps_;
   int frame_length_ms_;
+  rtc::Optional<int> target_audio_bitrate_bps_;
+  rtc::Optional<size_t> overhead_bytes_per_packet_;
   RTC_DISALLOW_COPY_AND_ASSIGN(BitrateController);
 };
 
 }  // namespace audio_network_adaptor
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_BITRATE_CONTROLLER_H_