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Also adds a test for documenting what happens when the limit is
reached.

Bug: 1115736
Change-Id: Ie488adb6b874ae47503670514bd7456bef8bfd6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354536Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797776}