Conversational Speech tool completed

webrtc/modules/audio_processing/test/conversational_speech/timing.cc

 /*
  *  Copyright (c) 2017 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 35 matching lines @@
     timing.push_back(parse_line(line));
   }
   infile.close();
 
   return timing;
 }
 
 void SaveTiming(const std::string& timing_filepath,
                 rtc::ArrayView<const Turn> timing) {
   std::ofstream outfile(timing_filepath);
-  // TODO(alessio): check if file open for writing.
+  RTC_CHECK(outfile.is_open());
   for (const Turn& turn : timing) {
     outfile << turn.speaker_name << " " << turn.audiotrack_file_name
         << " " << turn.offset << std::endl;
   }
   outfile.close();
 }
 
 }  // namespace conversational_speech
 }  // namespace test
 }  // namespace webrtc