This cl adds the code needed to record and submit the minimal
subset of commands required to run a simple triangle example.

The commands themselves are still unimplemented.

Bug b/116336664

Change-Id: Id0109980225a64a2bb3599a89a5495091926c635
Reviewed-on: https://swiftshader-review.googlesource.com/c/22168Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Corentin Wallez <cwallez@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>