Added -show_detector_state which show the detector state in the total bitrate graph.

webrtc/rtc_tools/event_log_visualizer/plot_base.cc

Index: webrtc/rtc_tools/event_log_visualizer/plot_base.cc
diff --git a/webrtc/rtc_tools/event_log_visualizer/plot_base.cc b/webrtc/rtc_tools/event_log_visualizer/plot_base.cc
index f1924b6f44b74b8f2623e7eea5451611bd4c8838..f979740d1ee477eb82bf878d32b51d7c09f4c619 100644
--- a/webrtc/rtc_tools/event_log_visualizer/plot_base.cc
+++ b/webrtc/rtc_tools/event_log_visualizer/plot_base.cc
@@ -75,6 +75,10 @@ void Plot::AppendTimeSeries(TimeSeries&& time_series) {
   series_list_.emplace_back(std::move(time_series));
 }
 
+void Plot::AppendIntervalSeries(IntervalSeries&& interval_series) {
+  interval_list_.emplace_back(std::move(interval_series));
+}
+
 void Plot::AppendTimeSeriesIfNotEmpty(TimeSeries&& time_series) {
   if (time_series.points.size() > 0) {
     series_list_.emplace_back(std::move(time_series));