Add plot of network delay change computed based on transport feedback.

webrtc/tools/event_log_visualizer/generate_timeseries.cc

 /*
  *  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.
  */
 
@@ skipping 29 matching lines @@
 DEFINE_bool(plot_total_bitrate,
             false,
             "Plot the total bitrate used by all streams.");
 DEFINE_bool(plot_stream_bitrate,
             false,
             "Plot the bitrate used by each stream.");
 DEFINE_bool(plot_bwe,
             false,
             "Run the bandwidth estimator with the logged rtp and rtcp and plot "
             "the output.");
+DEFINE_bool(plot_network_delay_feedback,
+            false,
+            "Compute network delay based on sent packets and the received "
+            "transport feedback.");
 
 int main(int argc, char* argv[]) {
   std::string program_name = argv[0];
   std::string usage =
       "A tool for visualizing WebRTC event logs.\n"
       "Example usage:\n" +
       program_name + " <logfile> | python\n" + "Run " + program_name +
       " --help for a list of command line options\n";
   google::SetUsageMessage(usage);
   google::ParseCommandLineFlags(&argc, &argv, true);
@@ skipping 73 matching lines @@
       analyzer.CreateStreamBitrateGraph(
           webrtc::PacketDirection::kOutgoingPacket,
           collection->AppendNewPlot());
     }
   }
 
   if (FLAGS_plot_all || FLAGS_plot_bwe) {
     analyzer.CreateBweGraph(collection->AppendNewPlot());
   }
 
+  if (FLAGS_plot_all || FLAGS_plot_network_delay_feedback) {
+    analyzer.CreateNetworkDelayFeebackGraph(collection->AppendNewPlot());
+  }
+
   collection->Draw();
 
   return 0;
 }