Fix export of plottable metrics on iOS

Bug: None
Change-Id: I12c3cecb92e5f163f9451d6f90de3bce9b15bca1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168942
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30580}

test/BUILD.gn

@@ -261,6 +261,7 @@ if (is_ios) {
     deps = [
       ":perf_test",
       "../sdk:helpers_objc",
+      "//third_party/abseil-cpp/absl/types:optional",
     ]
     configs += [ ":test_support_objc_config" ]
   }
@@ -394,6 +395,8 @@ if (rtc_include_tests) {
       "../system_wrappers:metrics",
       "//third_party/abseil-cpp/absl/flags:flag",
       "//third_party/abseil-cpp/absl/flags:parse",
+      "//third_party/abseil-cpp/absl/memory",
+      "//third_party/abseil-cpp/absl/types:optional",
     ]
   }
 

test/ios/test_support.h

@@ -11,6 +11,11 @@
 #ifndef TEST_IOS_TEST_SUPPORT_H_
 #define TEST_IOS_TEST_SUPPORT_H_
 
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+
 namespace rtc {
 namespace test {
 // Launches an iOS app that serves as a host for a test suite.
@@ -20,7 +25,8 @@ void RunTestsFromIOSApp();
 void InitTestSuite(int (*test_suite)(void),
                    int argc,
                    char* argv[],
-                   bool save_chartjson_result);
+                   bool save_chartjson_result,
+                   absl::optional<std::vector<std::string>> metrics_to_plot);
 
 }  // namespace test
 }  // namespace rtc

test/ios/test_support.mm

@@ -34,6 +34,7 @@ static int (*g_test_suite)(void) = NULL;
 static int g_argc;
 static char **g_argv;
 static bool g_save_chartjson_result;
+static absl::optional<std::vector<std::string>> g_metrics_to_plot;
 
 @interface UIApplication (Testing)
 - (void)_terminateWithStatus:(int)status;
@@ -88,6 +89,9 @@ static bool g_save_chartjson_result;
           [NSString stdStringForString:outputPath]);
     }
   }
+  if (g_metrics_to_plot) {
+    webrtc::test::PrintPlottableResults(*g_metrics_to_plot);
+  }
 
   // If a test app is too fast, it will exit before Instruments has has a
   // a chance to initialize and no test results will be seen.
@@ -109,12 +113,16 @@ namespace test {
 
 // Note: This is not thread safe, and must be called from the same thread as
 // runTests above.
-void InitTestSuite(int (*test_suite)(void), int argc, char *argv[],
-                   bool save_chartjson_result) {
+void InitTestSuite(int (*test_suite)(void),
+                   int argc,
+                   char *argv[],
+                   bool save_chartjson_result,
+                   absl::optional<std::vector<std::string>> metrics_to_plot) {
   g_test_suite = test_suite;
   g_argc = argc;
   g_argv = argv;
   g_save_chartjson_result = save_chartjson_result;
+  g_metrics_to_plot = std::move(metrics_to_plot);
 }
 
 void RunTestsFromIOSApp() {

test/test_main_lib.cc

@@ -16,6 +16,8 @@
 
 #include "absl/flags/flag.h"
 #include "absl/flags/parse.h"
+#include "absl/memory/memory.h"
+#include "absl/types/optional.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/event_tracer.h"
 #include "rtc_base/logging.h"
@@ -69,6 +71,7 @@ ABSL_FLAG(
     "by "
     "https://github.com/catapult-project/catapult/blob/master/dashboard/docs/"
     "data-format.md.");
+#endif
 
 constexpr char kPlotAllMetrics[] = "all";
 ABSL_FLAG(std::vector<std::string>,
@@ -78,8 +81,6 @@ ABSL_FLAG(std::vector<std::string>,
           "available). Example: psnr,ssim,encode_time. To plot all available "
           " metrics pass 'all' as flag value");
 
-#endif
-
 ABSL_FLAG(bool, logs, true, "print logs to stderr");
 ABSL_FLAG(bool, verbose, false, "verbose logs to stderr");
 
@@ -156,9 +157,22 @@ class TestMainImpl : public TestMain {
       rtc::tracing::StartInternalCapture(trace_event_path.c_str());
     }
 
+    absl::optional<std::vector<std::string>> metrics_to_plot =
+        absl::GetFlag(FLAGS_plot);
+
+    if (metrics_to_plot->empty()) {
+      metrics_to_plot = absl::nullopt;
+    } else {
+      if (metrics_to_plot->size() == 1 &&
+          (*metrics_to_plot)[0] == kPlotAllMetrics) {
+        metrics_to_plot->clear();
+      }
+    }
+
 #if defined(WEBRTC_IOS)
     rtc::test::InitTestSuite(RUN_ALL_TESTS, argc, argv,
-                             absl::GetFlag(FLAGS_save_chartjson_result));
+                             absl::GetFlag(FLAGS_save_chartjson_result),
+                             metrics_to_plot);
     rtc::test::RunTestsFromIOSApp();
     int exit_code = 0;
 #else
@@ -169,13 +183,8 @@ class TestMainImpl : public TestMain {
     if (!chartjson_result_file.empty()) {
       webrtc::test::WritePerfResults(chartjson_result_file);
     }
-    std::vector<std::string> metrics_to_plot = absl::GetFlag(FLAGS_plot);
-    if (!metrics_to_plot.empty()) {
-      if (metrics_to_plot.size() == 1 &&
-          metrics_to_plot[0] == kPlotAllMetrics) {
-        metrics_to_plot.clear();
-      }
-      webrtc::test::PrintPlottableResults(metrics_to_plot);
+    if (metrics_to_plot) {
+      webrtc::test::PrintPlottableResults(*metrics_to_plot);
     }
 
     std::string result_filename =