Refactor validation to be used in both the OES and ES3 entry points. BUG=angleproject:600 BUG=angleproject:1101 Change-Id: I2008c4ea04ce07910f03ae0b997f8a77b66203d8 Reviewed-on: https://chromium-review.googlesource.com/316620Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>
