*re-land with fix for matrix attributes*

Using the new vertex format type enum, we can shrink the size
of the input layout tables and reduce draw call overhead
further.

BUG=angleproject:959

Change-Id: I6d8ad78a003c41f40e7e1caa5972838f8ff4fce8
Reviewed-on: https://chromium-review.googlesource.com/284811Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>