Overlay REMB in total bitrate graphs in visualization tool.

webrtc/tools/event_log_visualizer/plot_base.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #ifndef WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_BASE_H_
@@ skipping 91 matching lines @@
                          std::string label,
                          float bottom_margin = 0,
                          float top_margin = 0);
 
   // Sets the title of the plot.
   void SetTitle(std::string title);
 
   // Add a new TimeSeries to the plot.
   void AppendTimeSeries(TimeSeries&& time_series);
 
+  // Add a new TimeSeries to the plot if the series contains contains data.
+  // Otherwise, the call has no effect and the timeseries is destroyed.
+  void AppendTimeSeriesIfNotEmpty(TimeSeries&& time_series);
+
  protected:
   float xaxis_min_;
   float xaxis_max_;
   std::string xaxis_label_;
   float yaxis_min_;
   float yaxis_max_;
   std::string yaxis_label_;
   std::string title_;
   std::vector<TimeSeries> series_list_;
 };
 
 class PlotCollection {
  public:
   virtual ~PlotCollection() {}
   virtual void Draw() = 0;
   virtual Plot* AppendNewPlot() = 0;
 
  protected:
   std::vector<std::unique_ptr<Plot> > plots_;
 };
 
 }  // namespace plotting
 }  // namespace webrtc
 
 #endif  // WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_BASE_H_