Define a protobuf format for representing plots

webrtc/tools/BUILD.gn

Index: webrtc/tools/BUILD.gn
diff --git a/webrtc/tools/BUILD.gn b/webrtc/tools/BUILD.gn
index 91564b989041707a8567f0b51ea905bd3b7b5ad8..d5514830085bc40bfae570a3ff5f20508194b8f3 100644
--- a/webrtc/tools/BUILD.gn
+++ b/webrtc/tools/BUILD.gn
@@ -7,6 +7,7 @@
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//testing/test.gni")
+import("//third_party/protobuf/proto_library.gni")
 import("../build/webrtc.gni")
 
 source_set("tools") {
@@ -175,12 +176,21 @@ source_set("agc_test_utils") {
 }
 
 if (rtc_enable_protobuf) {
+  proto_library("graph_proto") {
+    sources = [
+      "event_log_visualizer/graph.proto",
+    ]
+    proto_out_dir = "webrtc/tools/event_log_visualizer"
+  }
+
   source_set("event_log_visualizer_utils") {
     sources = [
       "event_log_visualizer/analyzer.cc",
       "event_log_visualizer/analyzer.h",
       "event_log_visualizer/plot_base.cc",
       "event_log_visualizer/plot_base.h",
+      "event_log_visualizer/plot_protobuf.cc",
+      "event_log_visualizer/plot_protobuf.h",
       "event_log_visualizer/plot_python.cc",
       "event_log_visualizer/plot_python.h",
     ]
@@ -201,6 +211,7 @@ if (rtc_enable_protobuf) {
       "//build/config/sanitizers:deps",
     ]
     public_deps = [
+      ":graph_proto",
       "../:rtc_event_log_parser",
     ]
   }