We used to enable smooth scrolling unconditionally in autotools (via WebKitFeatures.m4), but since the switch to CMake it's unconditionally disabled, so changing the setting doesn't have any effect.
Created attachment 239951 [details] Patch Bring it back
Created attachment 239955 [details] Re-submitted for EWS
Committed r174812: <http://trac.webkit.org/changeset/174812>
Comment on attachment 239955 [details] Re-submitted for EWS Manually clearing flags