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The regression test is odd but it's the smallest repro I could come up
with based on ClusterFuzz.

Bug: 1149132
Change-Id: I09fbb35c7cbdd47a14d9f68a6268285d193844cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559806
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831126}