Improved UI for event_log_analyzer tool

webrtc/rtc_tools/event_log_visualizer/analyzer.cc

Index: webrtc/rtc_tools/event_log_visualizer/analyzer.cc
diff --git a/webrtc/rtc_tools/event_log_visualizer/analyzer.cc b/webrtc/rtc_tools/event_log_visualizer/analyzer.cc
index b42f0820f48dd878e8263dd03aaf51747769d74b..016176b20977d494d5cbb69dfb6c810d21574592 100644
--- a/webrtc/rtc_tools/event_log_visualizer/analyzer.cc
+++ b/webrtc/rtc_tools/event_log_visualizer/analyzer.cc
@@ -813,7 +813,7 @@ void EventLogAnalyzer::CreateIncomingPacketLossGraph(Plot* plot) {
   plot->SetTitle("Estimated incoming loss rate");
 }
 
-void EventLogAnalyzer::CreateDelayChangeGraph(Plot* plot) {
+void EventLogAnalyzer::CreateIncomingDelayDeltaGraph(Plot* plot) {
   for (auto& kv : rtp_packets_) {
     StreamId stream_id = kv.first;
     const std::vector<LoggedRtpPacket>& packet_stream = kv.second;
@@ -843,10 +843,10 @@ void EventLogAnalyzer::CreateDelayChangeGraph(Plot* plot) {
   plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
   plot->SetSuggestedYAxis(0, 1, "Latency change (ms)", kBottomMargin,
                           kTopMargin);
-  plot->SetTitle("Network latency change between consecutive packets");
+  plot->SetTitle("Network latency difference between consecutive packets");
 }
 
-void EventLogAnalyzer::CreateAccumulatedDelayChangeGraph(Plot* plot) {
+void EventLogAnalyzer::CreateIncomingDelayGraph(Plot* plot) {
   for (auto& kv : rtp_packets_) {
     StreamId stream_id = kv.first;
     const std::vector<LoggedRtpPacket>& packet_stream = kv.second;
@@ -876,7 +876,7 @@ void EventLogAnalyzer::CreateAccumulatedDelayChangeGraph(Plot* plot) {
   plot->SetXAxis(0, call_duration_s_, "Time (s)", kLeftMargin, kRightMargin);
   plot->SetSuggestedYAxis(0, 1, "Latency change (ms)", kBottomMargin,
                           kTopMargin);
-  plot->SetTitle("Accumulated network latency change");
+  plot->SetTitle("Network latency (relative to first packet)");
 }
 
 // Plot the fraction of packets lost (as perceived by the loss-based BWE).
@@ -1408,8 +1408,7 @@ void EventLogAnalyzer::CreateAudioEncoderFrameLengthGraph(Plot* plot) {
   plot->SetTitle("Reported audio encoder frame length");
 }
 
-void EventLogAnalyzer::CreateAudioEncoderUplinkPacketLossFractionGraph(
-    Plot* plot) {
+void EventLogAnalyzer::CreateAudioEncoderPacketLossGraph(Plot* plot) {
   TimeSeries time_series("Audio encoder uplink packet loss fraction",
                          LINE_DOT_GRAPH);
   ProcessPoints<AudioNetworkAdaptationEvent>(