Add the possibility to output a json gtest output to the perf tests.

We use the Chromium existing flag isolated_script_test_output that we translate into gtest_output.
This is because the Chromium flag has the same purpose as gtest_output and is already provided in the recipe modules.

No-Presubmit: True
Bug: b/197492097
Change-Id: Ia432a85b0e0ab32008b39ffe751d11aefb9b24ea
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/251041
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Cr-Commit-Position: refs/heads/main@{#35937}

audio/test/low_bandwidth_audio_test.py

@@ -296,6 +296,9 @@ def main():
   else:
     test_command = [os.path.join(args.build_dir, 'low_bandwidth_audio_test')]
 
+  if args.isolated_script_test_output:
+    test_command += ['--gtest_output=json:' + args.isolated_script_test_output]
+
   analyzers = [Analyzer('pesq', _RunPesq, pesq_path, 16000)]
   # Check if POLQA can run at all, or skip the 48 kHz tests entirely.
   example_path = os.path.join(SRC_DIR, 'resources', 'voice_engine',
@@ -363,10 +366,6 @@ def main():
     with open(args.isolated_script_test_perf_output, 'wb') as f:
       f.write(histograms.AsProto().SerializeToString())
 
-  if args.isolated_script_test_output:
-    with open(args.isolated_script_test_output, 'w') as f:
-      json.dump({"version": 3}, f)
-
   return test_process.wait()
 
 

tools_webrtc/flags_compatibility.py

@@ -22,9 +22,7 @@ def main():
 
   test_command = _ForcePythonInterpreter(unrecognized_args)
   if args.isolated_script_test_output:
-    test_command += [
-        '--isolated_script_test_output', args.isolated_script_test_output
-    ]
+    test_command += ['--gtest_output=json:' + args.isolated_script_test_output]
   if args.isolated_script_test_perf_output:
     test_command += [
         '--isolated_script_test_perf_output=' +