With the new support for vertex formats living in the format utils,
we can use the Renderer class to query vertex properties instead of
the VertexBuffer class.

Change-Id: Id76bd4dbf63855016faccef703521887f50da3b9
Reviewed-on: https://chromium-review.googlesource.com/184521Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Nicolas Capens <nicolascapens@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>