take padding/border on flexbox into account with direction:rtl
Created attachment 108741 [details] Patch
Created attachment 108743 [details] Patch
Obviously the FIXME to make all these flowAware methods respect flex-flow applies to this new method as well.
Created attachment 108889 [details] Patch
Comment on attachment 108889 [details] Patch r=me
Committed r96159: <http://trac.webkit.org/changeset/96159>