angle_white_box_tests build and runs and passes on the iOS
simulator with this change. angle_end2end_tests builds and runs but
crashes.

Bug: angleproject:4256
Bug: angleproject:5417
Change-Id: I8817e46415c4598cbfae49804727a2e9b21baff1
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2600361
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>