Add trivial fuzzer to see if string compares work.

This is just a fuzzer to test whether different fuzzing engines
successfully spot string comparisons.

Bug: 330758175
Change-Id: I1a6e7ffbfde8477965f5b6138ebabd51a18f9f13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5387681


Auto-Submit: Adrian Taylor <adetaylor@chromium.org>
Commit-Queue: Adrian Taylor <adetaylor@chromium.org>
Reviewed-by: Paul Semel <paulsemel@chromium.org>
Commit-Queue: Paul Semel <paulsemel@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1276995}