Add packet rate plots to event_log_visualizer.

Bug: b/152399961
Change-Id: I8dbc0166ed537c197f26a80275100fb3faa338f5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/172094
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Kristoffer Erlandsson <kerl@google.com>
Cr-Commit-Position: refs/heads/master@{#30942}
diff --git a/rtc_tools/rtc_event_log_visualizer/analyzer.h b/rtc_tools/rtc_event_log_visualizer/analyzer.h
index c4f7220..e59e7b4 100644
--- a/rtc_tools/rtc_event_log_visualizer/analyzer.h
+++ b/rtc_tools/rtc_event_log_visualizer/analyzer.h
@@ -63,6 +63,8 @@
 
   void CreateAccumulatedPacketsGraph(PacketDirection direction, Plot* plot);
 
+  void CreatePacketRateGraph(PacketDirection direction, Plot* plot);
+
   void CreatePlayoutGraph(Plot* plot);
 
   void CreateAudioLevelGraph(PacketDirection direction, Plot* plot);