validationES: reorder draw validation for the WebGL CTS dEQP
validationES: reorder draw validation for the WebGL CTS dEQP

dEQP tries to test specific GL ES errors, but also triggers errors in
the additional WebGL validation. This commit reoders ANGLE's validation so
that WebGL-specific validation for draws is done after the common GL ES
checks.

BUG=angleproject:2021

Change-Id: Ie06b132ef6a4378f7c82ae8d354a8343d897c478
Reviewed-on: https://chromium-review.googlesource.com/493828
Commit-Queue: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ecoal95/angle,ecoal95/angle,ppy/angle,ecoal95/angle,ppy/angle,ecoal95/angle,MSOpenTech/angle,ecoal95/angle,MSOpenTech/angle,ppy/angle,MSOpenTech/angle,MSOpenTech/angle,ppy/angle