[New Multicolumn] Add a positioned object pagination test.
https://bugs.webkit.org/show_bug.cgi?id=110480.

Reviewed by Antti Koivisto.

* fast/multicol/newmulticol/positioned-split-expected.html: Added.
* fast/multicol/newmulticol/positioned-split.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143609 268f45cc-cd09-0410-ab3c-d52691b4dbfc