The Gtk port already builds with video track feature enabled. What's missing is enabling this feature in RuntimeEnabledFeatures.
Setting the depend flag on bug #72279. After the fix for that test lands, all tests should work and can be unskipped altogether.
Created attachment 135992 [details]
Comment on attachment 135992 [details]
Clearing flags on attachment: 135992
Committed r113446: <http://trac.webkit.org/changeset/113446>
All reviewed patches have been landed. Closing bug.