Introduced the new parameter setting scheme for activating the high-pass filter in APM

webrtc/modules/audio_processing/audio_processing.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
@@ skipping 59 matching lines @@
         'beamformer/nonlinear_beamformer.h',
         'common.h',
         'echo_cancellation_impl.cc',
         'echo_cancellation_impl.h',
         'echo_control_mobile_impl.cc',
         'echo_control_mobile_impl.h',
         'gain_control_for_experimental_agc.cc',
         'gain_control_for_experimental_agc.h',
         'gain_control_impl.cc',
         'gain_control_impl.h',
-        'high_pass_filter_impl.cc',
-        'high_pass_filter_impl.h',
         'include/audio_processing.cc',
         'include/audio_processing.h',
         'include/config.cc',
         'include/config.h',
         'level_controller/biquad_filter.cc',
         'level_controller/biquad_filter.h',
         'level_controller/down_sampler.cc',
         'level_controller/down_sampler.h',
         'level_controller/gain_applier.cc',
         'level_controller/gain_applier.h',
         'level_controller/gain_selector.cc',
         'level_controller/gain_selector.h',
         'level_controller/level_controller_constants.h',
         'level_controller/level_controller.cc',
         'level_controller/level_controller.h',
         'level_controller/noise_spectrum_estimator.cc',
         'level_controller/noise_spectrum_estimator.h',
         'level_controller/noise_level_estimator.cc',
         'level_controller/noise_level_estimator.h',
         'level_controller/peak_level_estimator.cc',
         'level_controller/peak_level_estimator.h',
         'level_controller/saturating_gain_estimator.cc',
         'level_controller/saturating_gain_estimator.h',
         'level_controller/signal_classifier.cc',
         'level_controller/signal_classifier.h',
         'level_estimator_impl.cc',
         'level_estimator_impl.h',
         'logging/apm_data_dumper.cc',
         'logging/apm_data_dumper.h',
+        'low_cut_filter.cc',
+        'low_cut_filter.h',
         'noise_suppression_impl.cc',
         'noise_suppression_impl.h',
         'render_queue_item_verifier.h',
         'rms_level.cc',
         'rms_level.h',
         'splitting_filter.cc',
         'splitting_filter.h',
         'three_band_filter_bank.cc',
         'three_band_filter_bank.h',
         'transient/common.h',
@@ skipping 194 matching lines @@
             'defines': ['WEBRTC_APM_DEBUG_DUMP=1',],
           }],
           ['apm_debug_dump==0', {
             'defines': ['WEBRTC_APM_DEBUG_DUMP=0',],
           }],
         ],
       }],
     }],
   ],
 }