Moving the vertex format information to a globally accessible
helper file makes them available for the dynamic shaders logic.

Change-Id: I67d6280c0603d9c601ca504751c8905677c2426f
Reviewed-on: https://chromium-review.googlesource.com/184399Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>