The memebers of SurfaceUpdateInfo are used to update tile except scaleFactor. scaleFactor is only used to create tile.
Created attachment 252996 [details] Patch
Comment on attachment 252996 [details] Patch Clearing flags on attachment: 252996 Committed r184312: <http://trac.webkit.org/changeset/184312>
All reviewed patches have been landed. Closing bug.