This reduces the footprint of the table considerably, and makes it
a little bit easier to maintain.

BUG=angleproject:1244

Change-Id: I84710729b94ba78813f9be2fcadb8c4d51fe8d7d
Reviewed-on: https://chromium-review.googlesource.com/317330
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>