This moves the validation and entry point files to use a
consistent syntax. This will facilitate auto-generation.

Bug: angleproject:2263
Change-Id: Ica2dbffff3898103c6827ae7f6b1154a45d14a85
Reviewed-on: https://chromium-review.googlesource.com/841345Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>