Chrome Version: (copy from chrome://version)
OS: (e.g. Win10, MacOS 10.12, etc...)

What steps will reproduce the problem?
(1) Load the attached test-case.

What is the expected result?

Both elements should look the same.

What happens instead?

The second element doesn't recover correctly from its appearance change.

This happens because HTMLProgressElement::CreateLayoutObject looks at style.HasAppearance(), but appearance changes don't cause a layout tree rebuild.