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

CL: 
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https://chromium.googlesource.com/chromium/src/+/b96dcc112f56bf4a48ca7ede5e7a03cb965a045b

Ref Bug: 
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https://bugs.chromium.org/p/chromium/issues/detail?id=699000

Thank you!