Add event log visualization of rtp timestamps over time.

webrtc/tools/event_log_visualizer/main.cc

Index: webrtc/tools/event_log_visualizer/main.cc
diff --git a/webrtc/tools/event_log_visualizer/main.cc b/webrtc/tools/event_log_visualizer/main.cc
index ce8feeafefca5df3258e752d5953cb7743c3d631..13a5b8a4f9353bc7bf30bd3b6f5425db800fefbc 100644
--- a/webrtc/tools/event_log_visualizer/main.cc
+++ b/webrtc/tools/event_log_visualizer/main.cc
@@ -59,6 +59,9 @@ DEFINE_bool(plot_fraction_loss,
             false,
             "Plot packet loss in percent for outgoing packets (as perceived by "
             "the send-side bandwidth estimator).");
+DEFINE_bool(plot_timestamps,
+            false,
+            "Plot the rtp timestamps of all rtp and rtcp packets over time.");
 DEFINE_string(
     force_fieldtrials,
     "",
@@ -180,6 +183,10 @@ int main(int argc, char* argv[]) {
     analyzer.CreateNetworkDelayFeedbackGraph(collection->AppendNewPlot());
   }
 
+  if (FLAGS_plot_all || FLAGS_plot_timestamps) {
+    analyzer.CreateTimestampGraph(collection->AppendNewPlot());
+  }
+
   collection->Draw();
 
   return 0;