The original API is designated as version 0.  The new API is
designated as version 1.  A new function is provided for determing the
version of the API that can be used.

Bug: angleproject:2794
Change-Id: I8205b462522cbc34d31643ea14815e187497abed
Reviewed-on: https://chromium-review.googlesource.com/c/1278836Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Commit-Queue: Ian Elliott <ianelliott@google.com>