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

R=mpdenton@chromium.org
BUG=817982

Change-Id: I24f365e3b1461082fd5abc725d3f905662faeb71
Reviewed-on: https://chromium-review.googlesource.com/c/1301460
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603351}