Adding audio DTX to video loopback test.

webrtc/video/video_quality_test.h

 /*
  *  Copyright (c) 2015 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.
  */
 #ifndef WEBRTC_VIDEO_VIDEO_QUALITY_TEST_H_
@@ skipping 37 matching lines @@
       int selected_tl;
       int min_transmit_bps;
       bool ulpfec;
       bool flexfec;
       std::string encoded_frame_base_path;
       std::string clip_name;
     } video;
     struct Audio {
       bool enabled;
       bool sync_video;
+      bool dtx;
     } audio;
     struct Screenshare {
       bool enabled;
       int32_t slide_change_interval;
       int32_t scroll_duration;
     } screenshare;
     struct Analyzer {
       std::string test_label;
       double avg_psnr_threshold;  // (*)
       double avg_ssim_threshold;  // (*)
@@ skipping 77 matching lines @@
   int send_logs_;
 
   VideoSendStream::DegradationPreference degradation_preference_ =
       VideoSendStream::DegradationPreference::kBalanced;
   Params params_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_VIDEO_QUALITY_TEST_H_