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Atomics.wait is a blocking call, and is only allowed on certain workers. See
the new web platform tests here:
https://github.com/w3c/web-platform-tests/pull/5569

BUG=chromium:711809

Review-Url: https://codereview.chromium.org/2841003002
Cr-Commit-Position: refs/heads/master@{#468188}