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These tests should ensure that bounds are being checked for span
functions and that these guarantees don't decay.

R=palmer@chromium.org
BUG=817982

Change-Id: Ief96bcc56a78187c615cbb15e906320290eafc59
Reviewed-on: https://chromium-review.googlesource.com/c/1317894Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Gabriela Melchior <gabimelchior@google.com>
Cr-Commit-Position: refs/heads/master@{#606017}