Reland "Use gtest_parallel with 1 worker for webrtc_perf_tests."

This is a reland of 258ed1a38ad9d4f0da798c40b6976eff2dce864f

Original change's description:
> Use gtest_parallel with 1 worker for webrtc_perf_tests.
>
> This will enable test results to be uploaded to ResultDB.
>
> Bug: b/197492097
> Change-Id: Iec28520c4cd8f35fcff2cbd105a4b851ef41b9fc
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239641
> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
> Reviewed-by: Christoffer Jansson <jansson@google.com>
> Commit-Queue: Jeremy Leconte <jleconte@google.com>
> Cr-Commit-Position: refs/heads/main@{#35458}

Bug: b/197492097
No-Presubmit: True
Change-Id: Iea90f5698c83791d39c0f6da666c1d1eb274edd3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/239645
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Reviewed-by: Andrey Logvin <landrey@webrtc.org>
Reviewed-by: Christoffer Jansson <jansson@webrtc.org>
Reviewed-by: Jakob Ivarsson <jakobi@webrtc.org>
Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35483}
diff --git a/audio/test/OWNERS b/audio/test/OWNERS
new file mode 100644
index 0000000..3754d48
--- /dev/null
+++ b/audio/test/OWNERS
@@ -0,0 +1,3 @@
+# Script to launch low_bandwidth_audio_test.
+per-file low_bandwidth_audio_test.py=mbonadei@webrtc.org
+per-file low_bandwidth_audio_test.py=jleconte@webrtc.org
diff --git a/audio/test/low_bandwidth_audio_test.py b/audio/test/low_bandwidth_audio_test.py
index 9aaf30f..d581b06 100755
--- a/audio/test/low_bandwidth_audio_test.py
+++ b/audio/test/low_bandwidth_audio_test.py
@@ -31,9 +31,9 @@
     'To fix this run:\n'
     '  python %s %s\n'
     '\n'
-    'Note that these tools are Google-internal due to licensing, so in order to '
-    'use them you will have to get your own license and manually put them in the '
-    'right location.\n'
+    'Note that these tools are Google-internal due to licensing, so in order '
+    'to use them you will have to get your own license and manually put them '
+    'in the right location.\n'
     'See https://cs.chromium.org/chromium/src/third_party/webrtc/tools_webrtc/'
     'download_tools.py?rcl=bbceb76f540159e2dba0701ac03c514f01624130&l=13')
 
@@ -65,6 +65,9 @@
         '--isolated-script-test-perf-output',
         default=None,
         help='Path to store perf results in histogram proto format.')
+    parser.add_argument('--dump_json_test_results',
+                        default=None,
+                        help='Path to store json test results.')
     parser.add_argument('--extra-test-args',
                         default=[],
                         action='append',
@@ -242,14 +245,14 @@
     checkout_root = os.path.abspath(
         os.path.join(script_dir, os.pardir, os.pardir))
 
-    # TODO(https://crbug.com/1029452): Use a copy rule and add these from the out
-    # dir like for the third_party/protobuf code.
+    # TODO(https://crbug.com/1029452): Use a copy rule and add these from the
+    # out dir like for the third_party/protobuf code.
     sys.path.insert(
         0, os.path.join(checkout_root, 'third_party', 'catapult', 'tracing'))
 
-    # The low_bandwidth_audio_perf_test gn rule will build the protobuf stub for
-    # python, so put it in the path for this script before we attempt to import
-    # it.
+    # The low_bandwidth_audio_perf_test gn rule will build the protobuf stub
+    # for python, so put it in the path for this script before we attempt to
+    # import it.
     histogram_proto_path = os.path.join(os.path.abspath(args.build_dir),
                                         'pyproto', 'tracing', 'tracing',
                                         'proto')
@@ -296,7 +299,10 @@
         ]
     else:
         test_command = [
-            os.path.join(args.build_dir, 'low_bandwidth_audio_test')
+            os.path.join('..', '..', 'tools_webrtc',
+                         'gtest-parallel-wrapper.py'),
+            os.path.join(args.build_dir, 'low_bandwidth_audio_test'),
+            '--dump_json_test_results=%s' % args.dump_json_test_results,
         ]
 
     analyzers = [Analyzer('pesq', _RunPesq, pesq_path, 16000)]
diff --git a/test/testsupport/perf_test.cc b/test/testsupport/perf_test.cc
index d282bf2..28d8e77 100644
--- a/test/testsupport/perf_test.cc
+++ b/test/testsupport/perf_test.cc
@@ -242,7 +242,7 @@
 bool WritePerfResults(const std::string& output_path) {
   std::string results = GetPerfResults();
   CreateDir(DirName(output_path));
-  FILE* output = fopen(output_path.c_str(), "wb");
+  FILE* output = fopen(output_path.c_str(), "ab");
   if (output == NULL) {
     printf("Failed to write to %s.\n", output_path.c_str());
     return false;
diff --git a/tools_webrtc/mb/mb.py b/tools_webrtc/mb/mb.py
index 09550fa..ec62996 100755
--- a/tools_webrtc/mb/mb.py
+++ b/tools_webrtc/mb/mb.py
@@ -906,14 +906,22 @@
         extra_files = [
             '../../.vpython',
             '../../testing/test_env.py',
+            '../../third_party/gtest-parallel/gtest-parallel',
+            '../../third_party/gtest-parallel/gtest_parallel.py',
+            '../../tools_webrtc/gtest-parallel-wrapper.py',
         ]
         vpython_exe = 'vpython'
+        #TODO(crbug.com/webrtc/13475) : use os.path module instead of 'sep'.
+        sep = '\\' if self.platform == 'win32' else '/'
+        output_dir = '${ISOLATED_OUTDIR}' + sep + 'test_logs'
+        test_results = '${ISOLATED_OUTDIR}' + sep + 'gtest_output.json'
 
         must_retry = False
         if test_type == 'script':
             cmdline += [vpython_exe,
                         '../../' +
-                        self.ToSrcRelPath(isolate_map[target]['script'])]
+                        self.ToSrcRelPath(isolate_map[target]['script']),
+                        '--dump_json_test_results=%s' % test_results]
         elif is_android:
             cmdline += [vpython_exe,
                         '../../build/android/test_wrapper/logdog_wrapper.py',
@@ -922,11 +930,6 @@
                         '--logcat-output-file', '${ISOLATED_OUTDIR}/logcats',
                         '--store-tombstones']
         else:
-            if test_type == 'raw':
-                cmdline += [vpython_exe,
-                            '../../tools_webrtc/flags_compatibility.py']
-                extra_files.append('../../tools_webrtc/flags_compatibility.py')
-
             if isolate_map[target].get('use_webcam', False):
                 cmdline += [vpython_exe,
                             '../../tools_webrtc/ensure_webcam_is_running.py']
@@ -943,33 +946,25 @@
             else:
                 cmdline += [vpython_exe, '../../testing/test_env.py']
 
+            cmdline += [
+                '../../tools_webrtc/gtest-parallel-wrapper.py',
+                '--output_dir=%s' % output_dir,
+                '--dump_json_test_results=%s' % test_results,
+                '--gtest_color=no',
+            ]
             if test_type != 'raw':
-                extra_files += [
-                    '../../third_party/gtest-parallel/gtest-parallel',
-                    '../../third_party/gtest-parallel/gtest_parallel.py',
-                    '../../tools_webrtc/gtest-parallel-wrapper.py',
-                ]
-                sep = '\\' if self.platform == 'win32' else '/'
-                output_dir = '${ISOLATED_OUTDIR}' + sep + 'test_logs'
-                test_results = '${ISOLATED_OUTDIR}' + sep + 'gtest_output.json'
+                # We tell gtest-parallel to interrupt the test after 900
+                # seconds, so it can exit cleanly and report results,
+                # instead of being interrupted by swarming and not
+                # reporting anything.
                 timeout = isolate_map[target].get('timeout', 900)
-                cmdline += [
-                    '../../tools_webrtc/gtest-parallel-wrapper.py',
-                    '--output_dir=%s' % output_dir,
-                    '--dump_json_test_results=%s' % test_results,
-                    '--gtest_color=no',
-                    # We tell gtest-parallel to interrupt the test after 900
-                    # seconds, so it can exit cleanly and report results,
-                    # instead of being interrupted by swarming and not
-                    # reporting anything.
-                    '--timeout=%s' % timeout,
-                ]
-                if test_type == 'non_parallel_console_test_launcher':
-                    # Still use the gtest-parallel-wrapper.py script since we
-                    # need it to run tests on swarming, but don't execute tests
-                    # in parallel.
-                    cmdline.append('--workers=1')
+                cmdline.append('--timeout=%s' % timeout)
                 must_retry = True
+            if test_type in ('raw', 'non_parallel_console_test_launcher'):
+                # Still use the gtest-parallel-wrapper.py script since we
+                # need it to run tests on swarming, but don't execute tests
+                # in parallel.
+                cmdline.append('--workers=1')
 
             asan = 'is_asan=true' in vals['gn_args']
             lsan = 'is_lsan=true' in vals['gn_args']
diff --git a/tools_webrtc/mb/mb_unittest.py b/tools_webrtc/mb/mb_unittest.py
index a65a55b..61786ea7 100755
--- a/tools_webrtc/mb/mb_unittest.py
+++ b/tools_webrtc/mb/mb_unittest.py
@@ -332,8 +332,13 @@
     files = isolate_file_contents['variables']['files']
     command = isolate_file_contents['variables']['command']
 
-    self.assertEqual(files, ['../../.vpython', '../../testing/test_env.py',
-                             'base_unittests'])
+    self.assertEqual(files, [
+        '../../.vpython', '../../testing/test_env.py',
+        '../../third_party/gtest-parallel/gtest-parallel',
+        '../../third_party/gtest-parallel/gtest_parallel.py',
+        '../../tools_webrtc/gtest-parallel-wrapper.py',
+        'base_unittests',
+    ])
     self.assertEqual(command, [
         'vpython',
         '../../build/android/test_wrapper/logdog_wrapper.py',
@@ -367,8 +372,13 @@
     files = isolate_file_contents['variables']['files']
     command = isolate_file_contents['variables']['command']
 
-    self.assertEqual(files, ['../../.vpython', '../../testing/test_env.py',
-                             'base_unittests'])
+    self.assertEqual(files, [
+        '../../.vpython', '../../testing/test_env.py',
+        '../../third_party/gtest-parallel/gtest-parallel',
+        '../../third_party/gtest-parallel/gtest_parallel.py',
+        '../../tools_webrtc/gtest-parallel-wrapper.py',
+        'base_unittests',
+    ])
     self.assertEqual(command, [
         'vpython',
         '../../build/android/test_wrapper/logdog_wrapper.py',
@@ -457,11 +467,15 @@
 
     self.assertEqual(files, [
         '../../.vpython', '../../testing/test_env.py',
+        '../../third_party/gtest-parallel/gtest-parallel',
+        '../../third_party/gtest-parallel/gtest_parallel.py',
+        '../../tools_webrtc/gtest-parallel-wrapper.py',
         'base_unittests', 'base_unittests_script.py',
     ])
     self.assertEqual(command, [
         'vpython',
         '../../base/base_unittests_script.py',
+        '--dump_json_test_results=${ISOLATED_OUTDIR}/gtest_output.json',
     ])
 
   def test_gen_raw(self):
@@ -491,14 +505,19 @@
     self.assertEqual(files, [
         '../../.vpython',
         '../../testing/test_env.py',
-        '../../tools_webrtc/flags_compatibility.py',
+        '../../third_party/gtest-parallel/gtest-parallel',
+        '../../third_party/gtest-parallel/gtest_parallel.py',
+        '../../tools_webrtc/gtest-parallel-wrapper.py',
         'base_unittests',
     ])
     self.assertEqual(command, [
         'vpython',
-        '../../tools_webrtc/flags_compatibility.py',
-        'vpython',
         '../../testing/test_env.py',
+        '../../tools_webrtc/gtest-parallel-wrapper.py',
+        '--output_dir=${ISOLATED_OUTDIR}/test_logs',
+        '--dump_json_test_results=${ISOLATED_OUTDIR}/gtest_output.json',
+        '--gtest_color=no',
+        '--workers=1',
         './base_unittests',
         '--asan=0',
         '--lsan=0',