The "Upload to test-results" fails with:

2018-08-17 05:02:18,388 - root - INFO - Sending request to https://test-results.appspot.com/testfile/upload at 2018-08-17 12:02:18.388193 UTC
Traceback (most recent call last):
  File "/b/rr/tmp0RiMc8/rw/checkout/scripts/slave/recipe_modules/test_results/resources/upload_test_results.py", line 216, in <module>
    sys.exit(main(sys.argv[1:]))
  File "/b/rr/tmp0RiMc8/rw/checkout/scripts/slave/recipe_modules/test_results/resources/upload_test_results.py", line 207, in main
    options.test_results_server, attrs, files, 120)
  File "/b/rr/tmp0RiMc8/rw/checkout/scripts/slave/recipe_modules/test_results/resources/test_results_uploader.py", line 51, in upload_test_results
    timeout_secs)
  File "/b/rr/tmp0RiMc8/rw/checkout/scripts/slave/recipe_modules/test_results/resources/test_results_uploader.py", line 135, in _retry_exp_backoff
    % (e.code, e.filename, e.read()))
test_results_uploader.PermanentError: Received HTTP status 400 loading "https://test-results.appspot.com/testfile/upload": uploaded file is missing required num_failures_by_type field
https://logs.chromium.org/logs/chrome/bb/chromium.perf.fyi/android-pixel2_webview-perf/1907/+/recipes/steps/Upload_to_test-results__performance_webview_test_suite_on_Android_device_Pixel_2_/0/stdout