gtest perf tests: Output well formed test results json

This CL changes the run_gtest_perf_test.py script to output well formed
test results json.

Bug: 855234
Change-Id: Ia5ce6e258865e34a2aa37635c014cd54efa62796
Reviewed-on: https://chromium-review.googlesource.com/1112635
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570943}

testing/scripts/run_gtest_perf_test.py

@@ -32,6 +32,7 @@ import json
 import os
 import shutil
 import sys
+import time
 import tempfile
 import traceback
 
@@ -108,12 +109,16 @@ def execute_perf_test(args, rest_args):
   env[CHROME_SANDBOX_ENV] = CHROME_SANDBOX_PATH
 
   rc = 0
+  start_time = time.time()
+  with common.temporary_file() as results_path:
     try:
       executable = rest_args[0]
       extra_flags = []
       if len(rest_args) > 1:
         extra_flags = rest_args[1:]
 
+      extra_flags.append('--test-launcher-summary-output=%s' % results_path)
+
       # These flags are to make sure that test output perf metrics in the log.
       if not '--verbose' in extra_flags:
         extra_flags.append('--verbose')
@@ -147,14 +152,36 @@ def execute_perf_test(args, rest_args):
       traceback.print_exc()
       rc = 1
 
-  valid = (rc == 0)
-  failures = [] if valid else ['(entire test suite)']
+    with open(results_path) as f:
+      test_results = common.get_gtest_summary_passes(json.load(f))
+
   output_json = {
-      'valid': valid,
-      'failures': failures,
+    'version': 3,
+    'interrupted': False,
+    'path_delimiter': '/',
+    'seconds_since_epoch': start_time,
+    'num_failures_by_type': {
+      'PASS': sum(1 for success in test_results.values() if success),
+      'FAIL': sum(1 for success in test_results.values() if not success),
+    },
+    'tests': {
+        test: test_result_entry(success) for (
+            test, success) in test_results.items()
     }
+  }
+
   return rc, charts, output_json
 
+
+def test_result_entry(success):
+  test = {
+    'expected': 'PASS',
+    'actual': 'PASS' if success else 'FAIL',
+  }
+  if not success:
+    test['unexpected'] = True
+  return test
+
 # This is not really a "script test" so does not need to manually add
 # any additional compile targets.
 def main_compile_targets(args):