This is needed for other work going on.
Created attachment 303346 [details] Patch
Created attachment 303349 [details] Patch with bug fixes
Created attachment 303350 [details] Updated with debugging instruction removed.\
Comment on attachment 303350 [details] Updated with debugging instruction removed.\ I tested this. I think it's right.
Committed r213397: <http://trac.webkit.org/changeset/213397>