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I made a fuzzer for this because this code is kind of complex.

Also, the user's clipboard can contain pretty arbitrary data, so we
want to validate we can handle all inputs with no problems.

Change-Id: Ifaa25d47d5cdc247bf7f73425011bab8deadd135
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869075Reviewed-by: Kevin Bailey <krb@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707540}