Add regression test for issue 507979.
Add regression test for issue 507979.

Regression test for CL 3eb91e8aec8e628adc1046fca16c5dfd1d129118.

BUG=chromium:507979
LOG=N

Review URL: https://codereview.chromium.org/1255173002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29873}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh