AGC2 as a new APM sub-module operating with hard-coded gain.

webrtc/modules/audio_processing/test/audio_processing_simulator.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 32 matching lines @@
   rtc::Optional<std::string> output_filename;
   rtc::Optional<std::string> reverse_output_filename;
   rtc::Optional<std::string> input_filename;
   rtc::Optional<std::string> reverse_input_filename;
   rtc::Optional<std::string> artificial_nearend_filename;
   rtc::Optional<bool> use_aec;
   rtc::Optional<bool> use_aecm;
   rtc::Optional<bool> use_ed;  // Residual Echo Detector.
   rtc::Optional<std::string> ed_graph_output_filename;
   rtc::Optional<bool> use_agc;
+  rtc::Optional<bool> use_agc2;
   rtc::Optional<bool> use_hpf;
   rtc::Optional<bool> use_ns;
   rtc::Optional<bool> use_ts;
   rtc::Optional<bool> use_bf;
   rtc::Optional<bool> use_ie;
   rtc::Optional<bool> use_vad;
   rtc::Optional<bool> use_le;
   rtc::Optional<bool> use_all;
   rtc::Optional<int> aec_suppression_level;
   rtc::Optional<bool> use_delay_agnostic;
@@ skipping 113 matching lines @@
   TickIntervalStats proc_time_;
   std::ofstream residual_echo_likelihood_graph_writer_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(AudioProcessingSimulator);
 };
 
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_AUDIO_PROCESSING_SIMULATOR_H_