Automated tests for the below commit have been missing.Would it be possible to add test coverage to avoid regressions in future?

CL: https://chromium.googlesource.com/chromium/src/+/335a187fa49bf9bcb98840782e46fbb697bf2893

Ref Bug: 
https://bugs.chromium.org/p/chromium/issues/detail?id=670539&desc=2

Thank you!