Prior to this CL compilation fails with:

- 'error: offset of on non-standard-layout type' due to offsetof()
- 'Assertion failed: vector subscript out of range' due to the OOB vector subscripts

Change-Id: I8751fafd1058ca839de832267811f8f1f47c53fe
Reviewed-on: https://chromium-review.googlesource.com/c/1400404Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58616}