Assigning to zmo@ who wrote the test.

I'll have to have the affected device to debug this issue

This issue is marked as Beta blocker, M53 is scheduled to be promoted to Beta next week (07/27) please resolve asap.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/af3ffdd21e5d85844ca1154d26431eff24ec7cf9

commit af3ffdd21e5d85844ca1154d26431eff24ec7cf9
Author: erikchen <erikchen@chromium.org>
Date: Thu Jul 21 22:34:56 2016

Fix GPUTestConfigTest.LoadCurrentConfig on macOS Sierra.

The test needs to be updated each time Chrome begins to support a new macOS
version.

BUG= 629708 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2172693002
Cr-Commit-Position: refs/heads/master@{#406971}

[modify] https://crrev.com/af3ffdd21e5d85844ca1154d26431eff24ec7cf9/gpu/config/gpu_test_config.cc
[modify] https://crrev.com/af3ffdd21e5d85844ca1154d26431eff24ec7cf9/gpu/config/gpu_test_config.h
[modify] https://crrev.com/af3ffdd21e5d85844ca1154d26431eff24ec7cf9/gpu/config/gpu_test_expectations_parser.cc
[modify] https://crrev.com/af3ffdd21e5d85844ca1154d26431eff24ec7cf9/gpu/config/gpu_test_expectations_parser_unittest.cc