We explicitly skip a whole bunch of directories known to not contain any test files (reference, resources, etc.). The W3C puts all support files in a directory named support, the runner should be updated to skip that, too so imported w3c tests needn't be modified.
Created attachment 236561 [details] Patch for the bug
r=me, we already have support directories in the tree, they just are lucky and don't contain anything that looks like a test. I'd like to double check with Ryosuke before landing, though.
Comment on attachment 236561 [details] Patch for the bug Looks great to me.
Comment on attachment 236561 [details] Patch for the bug Clearing flags on attachment: 236561 Committed r172638: <http://trac.webkit.org/changeset/172638>
All reviewed patches have been landed. Closing bug.