Reland of [testing/script] Switch run_telemetry_as_googletest.py to produce full json results format

testing/scripts/run_telemetry_as_googletest.py

Index: testing/scripts/run_telemetry_as_googletest.py
diff --git a/testing/scripts/run_telemetry_as_googletest.py b/testing/scripts/run_telemetry_as_googletest.py
index db489b8156a224a02f9b9203c70fde80dbf8f33b..82491845dc6273f5cfd88b806b7eccb104583fae 100755
--- a/testing/scripts/run_telemetry_as_googletest.py
+++ b/testing/scripts/run_telemetry_as_googletest.py
@@ -35,7 +35,7 @@
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument(
-      '--isolated-script-test-output', type=str,
+      '--isolated-script-test-output', type=argparse.FileType('w'),
       required=True)
   parser.add_argument('--xvfb', help='Start xvfb.', action='store_true')
   args, rest_args = parser.parse_known_args()
@@ -72,8 +72,23 @@
       '--shard-index=%d' % shard_index
     ]
   try:
-    return common.run_command([sys.executable] + rest_args + sharding_args + [
-      '--write-full-results-to', args.isolated_script_test_output], env=env)
+    with common.temporary_file() as tempfile_path:
+      rc = common.run_command([sys.executable] + rest_args + sharding_args + [
+        '--write-full-results-to', tempfile_path,
+      ], env=env)
+      with open(tempfile_path) as f:
+        results = json.load(f)
+      parsed_results = common.parse_common_test_results(results,
+                                                        test_separator='.')
+      failures = parsed_results['unexpected_failures']
+
+      json.dump({
+          'valid': bool(rc <= common.MAX_FAILURES_EXIT_STATUS and
+                        ((rc == 0) or failures)),
+          'failures': failures.keys(),
+      }, args.isolated_script_test_output)
+
+    return rc
   finally:
     xvfb.kill(xvfb_proc)
     xvfb.kill(openbox_proc)