https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8934814080768808336/+/steps/pixel_test_on_Intel_GPU_on_Mac__with_patch__on_Mac-10.12.6/0/stdout

"""
Traceback (most recent call last):
  <module> at /b/s/w/ir/third_party/catapult/telemetry/telemetry/testing/run_browser_tests.py:359
    ret_code = RunTests(sys.argv[1:])
  RunTests at /b/s/w/ir/third_party/catapult/telemetry/telemetry/testing/run_browser_tests.py:328
    ret, _, _ = runner.run()
  run at /b/s/w/ir/third_party/catapult/third_party/typ/typ/runner.py:179
    ret, full_results = self._run_tests(result_set, test_set)
  _run_tests at /b/s/w/ir/third_party/catapult/third_party/typ/typ/runner.py:466
    self._run_one_set(self.stats, result_set, test_set)
  _run_one_set at /b/s/w/ir/third_party/catapult/third_party/typ/typ/runner.py:511
    test_set.isolated_tests, 1)
  _run_list at /b/s/w/ir/third_party/catapult/third_party/typ/typ/runner.py:537
    _setup_process, _teardown_process)
  make_pool at /b/s/w/ir/third_party/catapult/third_party/typ/typ/pool.py:28
    return _AsyncPool(host, jobs, callback, context, pre_fn, post_fn)
  __init__ at /b/s/w/ir/third_party/catapult/third_party/typ/typ/pool.py:188
    self.context_after_pre = pre_fn(self.host, 1, self.context)
  _setup_process at /b/s/w/ir/third_party/catapult/third_party/typ/typ/runner.py:807
    child.context_after_setup = child.setup_fn(child, child.context)
  _SetUpProcess at /b/s/w/ir/third_party/catapult/telemetry/telemetry/testing/run_browser_tests.py:349
    context.test_class.SetUpProcess()
  SetUpProcess at /b/s/w/ir/content/test/gpu/gpu_tests/pixel_integration_test.py:67
    options.dont_restore_color_profile_after_test)
  ForceUntilExitSRGB at /b/s/w/ir/content/test/gpu/gpu_tests/color_profile_manager.py:22
    color_profile_manager_mac.GetDisplaysToProfileURLMap()
  GetDisplaysToProfileURLMap at /b/s/w/ir/content/test/gpu/gpu_tests/color_profile_manager_mac.py:83
    device_id = device_info['DeviceID']
TypeError: 'NoneType' object has no attribute '__getitem__'
"""

Not sure what the root cause of this problem is, but at the very least the test code should gracefully handle a None result.