Split NetEq simulation and jitter buffer plot to be able to plot other metrics in the simulation.

Bug: webrtc:9147
Change-Id: Ied37dedd19fc24a48700fb01645cee6288d3efa7
Reviewed-on: https://webrtc-review.googlesource.com/70160
Commit-Queue: Minyue Li <minyue@webrtc.org>
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23125}

rtc_tools/event_log_visualizer/main.cc

@@ -333,7 +333,8 @@ int main(int argc, char* argv[]) {
       wav_path = webrtc::test::ResourcePath(
           "audio_processing/conversational_speech/EN_script2_F_sp2_B1", "wav");
     }
-    analyzer.CreateAudioJitterBufferGraph(wav_path, 48000,
+    auto neteq_stats = analyzer.SimulateNetEq(wav_path, 48000);
+    analyzer.CreateAudioJitterBufferGraph(neteq_stats,
                                           collection->AppendNewPlot());
   }