diff --git a/test/test_flags.cc b/test/test_flags.cc
index 3f30aff39a..a0becc2ab7 100644
--- a/test/test_flags.cc
+++ b/test/test_flags.cc
@@ -36,3 +36,10 @@ ABSL_FLAG(
     "Path where the perf results should be stored in proto format described "
     "described by histogram.proto in "
     "https://chromium.googlesource.com/catapult/.");
+
+ABSL_FLAG(std::string,
+          webrtc_test_metrics_output_path,
+          "",
+          "Path where the test perf metrics should be stored using "
+          "api/test/metrics/metric.proto proto format. File will contain "
+          "MetricsSet as a root proto");
diff --git a/test/test_flags.h b/test/test_flags.h
index 694b4540ce..6ca30b22f0 100644
--- a/test/test_flags.h
+++ b/test/test_flags.h
@@ -18,5 +18,6 @@
 ABSL_DECLARE_FLAG(std::string, force_fieldtrials);
 ABSL_DECLARE_FLAG(std::vector<std::string>, plot);
 ABSL_DECLARE_FLAG(std::string, isolated_script_test_perf_output);
+ABSL_DECLARE_FLAG(std::string, webrtc_test_metrics_output_path);
 
 #endif  // TEST_TEST_FLAGS_H_