It fails for all boards: https://stainless.corp.google.com/search?test=%5Eplatform%5C_AddPrinter%5C.epson%24&exclude_non_release=true&exclude_cts=true&col=build&row=board_model&view=matrix&first_date=2018-10-16&last_date=2018-10-22

Looking at logs from one failure: https://stainless.corp.google.com/browse/chromeos-autotest-results/250033185-chromeos-test/

10/19 13:04:07.036 WARNI|              test:0606| The test failed with the following exception
Traceback (most recent call last):
  File "/usr/local/autotest/common_lib/test.py", line 600, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/usr/local/autotest/common_lib/test.py", line 800, in _call_test_function
    return func(*args, **dargs)
  File "/usr/local/autotest/common_lib/test.py", line 464, in execute
    postprocess_profiled_run, args, dargs)
  File "/usr/local/autotest/common_lib/test.py", line 371, in _call_run_once
    self.run_once(*args, **dargs)
  File "/usr/local/autotest/tests/platform_AddPrinter/platform_AddPrinter.py", line 190, in run_once
    self.print_a_page(os.path.join(current_dir, golden_file));
  File "/usr/local/autotest/tests/platform_AddPrinter/platform_AddPrinter.py", line 134, in print_a_page
    raise error.TestFail('ERROR: Printing request is not verified!')
TestFail: ERROR: Printing request is not verified!