No need to check the shadow tree anymore since sliders now uses touch events.
Created attachment 196689 [details] Patch
Comment on attachment 196689 [details] Patch Ok.
Comment on attachment 196689 [details] Patch Clearing flags on attachment: 196689 Committed r147807: <http://trac.webkit.org/changeset/147807>
All reviewed patches have been landed. Closing bug.
Pay attention to this one: 2013-03-24 Hayato Ito <hayato@chromium.org> Allow ShadowContents in HitTests by default. https://bugs.webkit.org/show_bug.cgi?id=113171 Shadow tree is hit-test'ed by default now.