Define a protobuf format for representing plots

webrtc/tools/event_log_visualizer/plot_protobuf.h

Index: webrtc/tools/event_log_visualizer/plot_protobuf.h
diff --git a/webrtc/tools/event_log_visualizer/plot_python.h b/webrtc/tools/event_log_visualizer/plot_protobuf.h
similarity index 54%
copy from webrtc/tools/event_log_visualizer/plot_python.h
copy to webrtc/tools/event_log_visualizer/plot_protobuf.h
index 2bf445a43e7c278bc77630ee522588d202fd1584..1ea525b20af06099dfa6902324f93304ba6c6136 100644
--- a/webrtc/tools/event_log_visualizer/plot_python.h
+++ b/webrtc/tools/event_log_visualizer/plot_protobuf.h
@@ -7,30 +7,33 @@
  *  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_PYTHON_H_
-#define WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_PYTHON_H_
+#ifndef WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_PROTOBUF_H_
+#define WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_PROTOBUF_H_
 
+#include "webrtc/tools/event_log_visualizer/graph.pb.h"
 #include "webrtc/tools/event_log_visualizer/plot_base.h"
 
 namespace webrtc {
 namespace plotting {
 
-class PythonPlot final : public Plot {
+class ProtobufPlot final : public Plot {
  public:
-  PythonPlot();
-  ~PythonPlot() override;
+  ProtobufPlot();
+  ~ProtobufPlot() override;
   void Draw() override;
+  void ExportProtobuf(protobuf_plot::Plot* plot);
 };
 
-class PythonPlotCollection final : public PlotCollection {
+class ProtobufPlotCollection final : public PlotCollection {
  public:
-  PythonPlotCollection();
-  ~PythonPlotCollection() override;
+  ProtobufPlotCollection();
+  ~ProtobufPlotCollection() override;
   void Draw() override;
   Plot* AppendNewPlot() override;
+  void ExportProtobuf(protobuf_plot::PlotCollection* collection);
 };
 
 }  // namespace plotting
 }  // namespace webrtc
 
-#endif  // WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_PYTHON_H_
+#endif  // WEBRTC_TOOLS_EVENT_LOG_VISUALIZER_PLOT_PROTOBUF_H_