This test is very infrequent timeout across Mac. It most frequently times out on Mac wk1
marked this test as timeout in: https://trac.webkit.org/changeset/254020/webkit
When did it regress, at least roughly?
This test has been timing out sense it was introduced in https://trac.webkit.org/changeset/252121/webkit
Logging reveals getError() is the last method being called; it is making it down to the GraphicsContextGL call, which means the issue likely lies in the driver.
Switching to ANGLE may actually fix this (since right now it does not call the ANGLE version of glGetError). Even if it is not getError, it doesn’t appear anything is hanging at the WebKit level so it is worth revisiting this after the ANGLE switch.
Removed flaky expectation in r260879 since this test has been consistently passing for the past few weeks.