[cgiow] (1) Allow addHitRegion() to be used with elements that are only focusable because of tabindex='' or sortable='' (since they're basically just buttons at that point)
Affected topics: Canvas

git-svn-id: http://svn.whatwg.org/webapps@8491 340c8d12-0b0e-0410-8428-c7bf67bfef74