Add BWE plot to event log analyzer.

webrtc/tools/BUILD.gn

Index: webrtc/tools/BUILD.gn
diff --git a/webrtc/tools/BUILD.gn b/webrtc/tools/BUILD.gn
index abf0ca0482750ce793603b0f7e4254699b69893a..fb77066c4bbb3c8deeadc3cbb69a7190f7f5f3ce 100644
--- a/webrtc/tools/BUILD.gn
+++ b/webrtc/tools/BUILD.gn
@@ -173,6 +173,7 @@ source_set("agc_test_utils") {
 if (rtc_include_tests) {
   if (rtc_enable_protobuf) {
     executable("event_log_visualizer") {
+      testonly = true
       sources = [
         "event_log_visualizer/analyzer.cc",
         "event_log_visualizer/analyzer.h",
@@ -194,8 +195,10 @@ if (rtc_include_tests) {
       defines = [ "ENABLE_RTC_EVENT_LOG" ]
       deps = [
         "../:rtc_event_log_parser",
+        "../modules/congestion_controller:congestion_controller",
         "../modules/rtp_rtcp:rtp_rtcp",
         "../system_wrappers:system_wrappers_default",
+        "../test:field_trial",
         "//third_party/gflags",
       ]
     }