As r174380 did, ScrollView::scrollTo() also calls requestScrollPositionUpdate() instead of delegatedScrollRequested(). Then delegatedScrollRequested() will be only called by ScrollingCoordinatorCoordinatedGraphics::requestScrollPositionUpdate(), and it needs to be merged by existing other scroll function.
Created attachment 239387 [details]
Comment on attachment 239387 [details]
Clearing flags on attachment: 239387
Committed r174416: <http://trac.webkit.org/changeset/174416>
All reviewed patches have been landed. Closing bug.