Added enums to InternalFormat and PixelType groups in gl.xml Bug: angleproject:4093 Change-Id: Ib69f0553f79d0e5dfbcc9165ad71a42be3e6d55d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1965643 Commit-Queue: Brandon Schade <b.schade@samsung.com> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>