Deactivated the intelligibility enhancement functionality by default

webrtc/modules/BUILD.gn

 # 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.
 
 import("../build/webrtc.gni")
 import("audio_coding/audio_coding.gni")
@@ skipping 181 matching lines @@
       "audio_processing/agc/loudness_histogram_unittest.cc",
       "audio_processing/agc/mock_agc.h",
       "audio_processing/audio_buffer_unittest.cc",
       "audio_processing/beamformer/array_util_unittest.cc",
       "audio_processing/beamformer/complex_matrix_unittest.cc",
       "audio_processing/beamformer/covariance_matrix_generator_unittest.cc",
       "audio_processing/beamformer/matrix_unittest.cc",
       "audio_processing/beamformer/mock_nonlinear_beamformer.h",
       "audio_processing/beamformer/nonlinear_beamformer_unittest.cc",
       "audio_processing/echo_cancellation_impl_unittest.cc",
-      "audio_processing/intelligibility/intelligibility_enhancer_unittest.cc",
-      "audio_processing/intelligibility/intelligibility_utils_unittest.cc",
       "audio_processing/splitting_filter_unittest.cc",
       "audio_processing/transient/dyadic_decimator_unittest.cc",
       "audio_processing/transient/file_utils.cc",
       "audio_processing/transient/file_utils.h",
       "audio_processing/transient/file_utils_unittest.cc",
       "audio_processing/transient/moving_moments_unittest.cc",
       "audio_processing/transient/transient_detector_unittest.cc",
       "audio_processing/transient/transient_suppressor_unittest.cc",
       "audio_processing/transient/wpd_node_unittest.cc",
       "audio_processing/transient/wpd_tree_unittest.cc",
@@ skipping 127 matching lines @@
       "video_coding/utility/quality_scaler_unittest.cc",
       "video_coding/video_coding_robustness_unittest.cc",
       "video_coding/video_packet_buffer_unittest.cc",
       "video_coding/video_receiver_unittest.cc",
       "video_coding/video_sender_unittest.cc",
       "video_processing/test/denoiser_test.cc",
       "video_processing/test/video_processing_unittest.cc",
       "video_processing/test/video_processing_unittest.h",
     ]
 
+    if (rtc_enable_intelligibility_enhancer) {
+      defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=1" ]
+      sources += [
+        "audio_processing/intelligibility/intelligibility_enhancer_unittest.cc",
+        "audio_processing/intelligibility/intelligibility_utils_unittest.cc",
+      ]
+    } else {
+      defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=0" ]
+    }
+
     if (rtc_libvpx_build_vp9) {
       sources +=
           [ "video_coding/codecs/vp9/vp9_screenshare_layers_unittest.cc" ]
     }
 
     if (rtc_desktop_capture_supported || is_android) {
       deps += [ "desktop_capture" ]
       sources += [
         "desktop_capture/desktop_region_unittest.cc",
         "desktop_capture/differ_block_unittest.cc",
@@ skipping 264 matching lines @@
         "audio_device/ios/objc/RTCAudioSessionTest.mm",
         "video_coding/codecs/h264/h264_video_toolbox_nalu_unittest.cc",
       ]
 
       ldflags = [ "-ObjC" ]
 
       # TODO(kjellander): Mac bundle files.
     }
   }
 }