Only seen on Intel as of yet. Other configs are possibly already suppressed.

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Mac%20FYI%20Release%20%28Intel%29/3320

[106/135] gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest.WebglConformance_deqp_functional_gles3_shaderoperator_common_functions failed unexpectedly 968.6528s:

Dashboard link:

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webgl2_conformance_tests&tests=gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest.WebglConformance_deqp_functional_gles3_shaderoperator_common_functions

Flakes on ANGLE CQ:

https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_angle_rel_ng/1266
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/mac_angle_rel_ng/1262