GL: Re-enable emulatePrimitiveRestartFixedIndex This workaround is needed when the GL driver is less than 4.3 (all MacOS). The driver will generate many errors during execution without this enabled which blocks GL driver error checking. Add additional workarounds for Intel drivers that need a sufficiently large primitive restart index when doing DrawArrays calls. BUG=angleproject:3997 Change-Id: Idd293ff1dbc0a3609b11ea1d6b30da0a99e8f5c5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2141714 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>