Add BWE plot to event log analyzer.

webrtc/tools/event_log_visualizer/plot_python.cc

Index: webrtc/tools/event_log_visualizer/plot_python.cc
diff --git a/webrtc/tools/event_log_visualizer/plot_python.cc b/webrtc/tools/event_log_visualizer/plot_python.cc
index 916bc2e6a61451359e1e3cff6b746ac6d98d7b53..f588214dcd1db22065e8da9eac338cdc63c80f2a 100644
--- a/webrtc/tools/event_log_visualizer/plot_python.cc
+++ b/webrtc/tools/event_log_visualizer/plot_python.cc
@@ -58,6 +58,11 @@ void PythonPlot::draw() {
       } else if (series[i].style == LINE_GRAPH) {
         printf("plt.plot(x%zu, y%zu, color=rgb_colors[%zu], label=\'%s\')\n", i,
                i, i, series[i].label.c_str());
+      } else if (series[i].style == LINE_DOT_GRAPH) {
+        printf(
+            "plt.plot(x%zu, y%zu, color=rgb_colors[%zu], label=\'%s\', "
+            "marker='.')\n",
+            i, i, i, series[i].label.c_str());
       } else {
         printf("raise Exception(\"Unknown graph type\")\n");
       }