Renamed and restructured the protobuf definitions for the rtc_event_log graphs.

BUG=

Review-Url: https://codereview.webrtc.org/2310403002
Cr-Commit-Position: refs/heads/master@{#14112}
diff --git a/webrtc/tools/event_log_visualizer/plot_protobuf.cc b/webrtc/tools/event_log_visualizer/plot_protobuf.cc
index 7f032c1..e6e1adc 100644
--- a/webrtc/tools/event_log_visualizer/plot_protobuf.cc
+++ b/webrtc/tools/event_log_visualizer/plot_protobuf.cc
@@ -21,36 +21,37 @@
 
 void ProtobufPlot::Draw() {}
 
-void ProtobufPlot::ExportProtobuf(protobuf_plot::Plot* plot) {
+void ProtobufPlot::ExportProtobuf(webrtc::analytics::Chart* chart) {
   for (size_t i = 0; i < series_list_.size(); i++) {
-    protobuf_plot::DataSet* data_set = plot->add_data_sets();
+    webrtc::analytics::DataSet* data_set = chart->add_data_sets();
     for (const auto& point : series_list_[i].points) {
-      data_set->add_xvalues(point.x);
+      data_set->add_x_values(point.x);
     }
     for (const auto& point : series_list_[i].points) {
-      data_set->add_yvalues(point.y);
+      data_set->add_y_values(point.y);
     }
 
     if (series_list_[i].style == BAR_GRAPH) {
-      data_set->set_style(protobuf_plot::BAR_GRAPH);
+      data_set->set_style(webrtc::analytics::ChartStyle::BAR_CHART);
     } else if (series_list_[i].style == LINE_GRAPH) {
-      data_set->set_style(protobuf_plot::LINE_GRAPH);
+      data_set->set_style(webrtc::analytics::ChartStyle::LINE_CHART);
     } else if (series_list_[i].style == LINE_DOT_GRAPH) {
-      data_set->set_style(protobuf_plot::LINE_DOT_GRAPH);
+      data_set->set_style(webrtc::analytics::ChartStyle::LINE_CHART);
+      data_set->set_highlight_points(true);
     } else {
-      data_set->set_style(protobuf_plot::UNDEFINED);
+      data_set->set_style(webrtc::analytics::ChartStyle::UNDEFINED);
     }
 
     data_set->set_label(series_list_[i].label);
   }
 
-  plot->set_xaxis_min(xaxis_min_);
-  plot->set_xaxis_max(xaxis_max_);
-  plot->set_yaxis_min(yaxis_min_);
-  plot->set_yaxis_max(yaxis_max_);
-  plot->set_xaxis_label(xaxis_label_);
-  plot->set_yaxis_label(yaxis_label_);
-  plot->set_title(title_);
+  chart->set_xaxis_min(xaxis_min_);
+  chart->set_xaxis_max(xaxis_max_);
+  chart->set_yaxis_min(yaxis_min_);
+  chart->set_yaxis_max(yaxis_max_);
+  chart->set_xaxis_label(xaxis_label_);
+  chart->set_yaxis_label(yaxis_label_);
+  chart->set_title(title_);
 }
 
 ProtobufPlotCollection::ProtobufPlotCollection() {}
@@ -60,12 +61,13 @@
 void ProtobufPlotCollection::Draw() {}
 
 void ProtobufPlotCollection::ExportProtobuf(
-    protobuf_plot::PlotCollection* collection) {
+    webrtc::analytics::ChartCollection* collection) {
   for (const auto& plot : plots_) {
     // TODO(terelius): Ensure that there is no way to insert plots other than
     // ProtobufPlots in a ProtobufPlotCollection. Needed to safely static_cast
     // here.
-    protobuf_plot::Plot* protobuf_representation = collection->add_plots();
+    webrtc::analytics::Chart* protobuf_representation
+        = collection->add_charts();
     static_cast<ProtobufPlot*>(plot.get())
         ->ExportProtobuf(protobuf_representation);
   }