Enforce correct usage of gl::Version In preparation for the implementation update, ensured that gl::Version struct is always initialized with 8-bit values. Bug: angleproject:408843436 Change-Id: Idcc925b49cadc7fdc4f05ff2acaed8020e72a32e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6458758 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>