More tests for shape-outside on floats with positive margins

These are the remaning test cases that were not covered in earlier bug
fixes, mostly tests for vertical writing modes when combined with
positive margins on the floats.

BUG=260357

Review URL: https://chromiumcodereview.appspot.com/25141002

git-svn-id: svn://svn.chromium.org/blink/trunk@158493 bbb929c8-8fbe-4397-9dbb-9b2b20218538