[scroll-animation-1] Define scroll linked animation behavior in printing documents

[chromium-helper]

CSSWG added the following resolution(s):

• RESOLVED: for printing/paged, root is considered fully in view (scroll timelines on it are inactive)

in w3c/csswg-drafts#8226 (comment)

[chromium-helper]

I have filed crbug.com/1425946

That is all that can be done here, closing issue.