Made it so that for absolutely positioned frames we pass in the containing
block width/height to the HTML reflow state, rather than have it compute it.
This means we get a bottom up size rather than a top down size. That fixes
a problem where for containing blocks with a specified 'height' of 'auto' we
weren't correctly calculating the containing block height
git-svn-id: svn://10.0.0.236/trunk@50657 18797224-902f-48f8-a5cc-f745e15eee43
3007f63368