These include the new sampler types, non-square matices, and
unsigned int vectors.

BUG=angle:466

Change-Id: I0d88fadfc3f81a2d9be604ee1dffefd5a4a343c5
Reviewed-on: https://chromium-review.googlesource.com/205838Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Nicolas Capens <capn@chromium.org>