Video/Screenshare loopback tool.

webrtc/rtc_tools/event_log_visualizer/plot_python.cc

Index: webrtc/rtc_tools/event_log_visualizer/plot_python.cc
diff --git a/webrtc/rtc_tools/event_log_visualizer/plot_python.cc b/webrtc/rtc_tools/event_log_visualizer/plot_python.cc
index dae285526ec93d45f5fda3ba7a9ad012d14a07a9..9202c02db6c2fb087483175b25dfdb167682babf 100644
--- a/webrtc/rtc_tools/event_log_visualizer/plot_python.cc
+++ b/webrtc/rtc_tools/event_log_visualizer/plot_python.cc
@@ -91,8 +91,8 @@ void PythonPlot::Draw() {
     }
 
     // IntervalSeries
-    printf("interval_colors = ['#ff8e82','#5092fc','#c4ffc4']\n");
-    RTC_CHECK_LE(interval_list_.size(), 3);
+    printf("interval_colors = ['#ff8e82','#5092fc','#c4ffc4', '#555555']\n");
+    RTC_CHECK_LE(interval_list_.size(), 4);
     // To get the intervals to show up in the legend we have to created patches
     // for them.
     printf("legend_patches = []\n");
@@ -119,11 +119,20 @@ void PythonPlot::Draw() {
             "alpha=0.3)\n",
             i, i, i);
       } else {
-        printf(
-            "  plt.axvspan(ival%zu[i][0], ival%zu[i][1], "
-            "facecolor=interval_colors[%zu], "
-            "alpha=0.3)\n",
-            i, i, i);
+        if (i < 3) {
+          printf(
+              "  plt.axvspan(ival%zu[i][0], ival%zu[i][1], "
+              "facecolor=interval_colors[%zu], "
+              "alpha=0.3)\n",
+              i, i, i);
+        } else {
+          printf(
+              "  plt.axvspan(ival%zu[i][0], ival%zu[i][1], "
+              "color=\"none\", "
+              "hatch = '/', "
+              "alpha=0.15)\n",
+              i, i);
+        }
       }
       printf(
           "legend_patches.append(mpatches.Patch(ec=\'black\', "