Test various ways of organizing attributes: in memory or buffer object,
sequential or interleaved.
Test different types of vertex data.
Test non-indexed draw, indices in buffer, indices in memory.
Test starting at vertex zero and higher.

BUG=angleproject:1683

Change-Id: I54a752679b31bbb3f573c922d59da69a18302daa
Reviewed-on: https://chromium-review.googlesource.com/898608
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>