Make vertical-lr and vertical-rl versions of the tests that replace border-padding-pagination.html

border-padding-pagination.html exists for both these writing modes, and it won't be
used in the new implementation, so better make sure that we don't lose coverage.

R=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/510123002

git-svn-id: svn://svn.chromium.org/blink/trunk@181622 bbb929c8-8fbe-4397-9dbb-9b2b20218538