Add new variance update option and unittests for intelligibility

webrtc/modules/audio_processing/intelligibility/test/intelligibility_proc.cc

 /*
  *  Copyright (c) 2014 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.
  */
 
 //
 //  Command line tool for speech intelligibility enhancement. Provides for
 //  running and testing intelligibility_enhancer as an independent process.
 //  Use --help for options.
 //
 
 #include <stdint.h>
 #include <stdlib.h>
-#include <string>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <string>
 
 #include "gflags/gflags.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/common_audio/real_fourier.h"
 #include "webrtc/common_audio/wav_file.h"
 #include "webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.h"
 #include "webrtc/modules/audio_processing/intelligibility/intelligibility_utils.h"
 #include "webrtc/system_wrappers/interface/critical_section_wrapper.h"
 #include "webrtc/test/testsupport/fileutils.h"
@@ skipping 104 matching lines @@
     out_file.WriteSamples(&in_fpcm[0], samples);
   }
 }
 
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   webrtc::void_main(argc, argv);
   return 0;
 }