These tests have opaque fd and zircon handle variants that only differ
in the handle operations. Turn the test into a template that runs twice
with an opaque fd and fuchsia template argument.

Bug: angleproject:3289
Change-Id: Ibb3baaa8eef239e3747a0e74ce17396637c8bcd9
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2195686
Commit-Queue: Michael Spang <spang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>