The GL expects us to reject invalid draw calls before we start
doing any work, so we can prevent internal unnecessary state
changes.

BUG=angle:571

Change-Id: Ic71218b3c2d5dc310280d3738bb1387753a10e03
Reviewed-on: https://chromium-review.googlesource.com/203770Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>