We can early return in ViewportConfiguration::setDefaultConfiguration if the viewport params haven't changed.
Created attachment 328191 [details] Patch
Created attachment 328197 [details] Patch
Comment on attachment 328197 [details] Patch Clearing flags on attachment: 328197 Committed r225441: <https://trac.webkit.org/changeset/225441>
All reviewed patches have been landed. Closing bug.
<rdar://problem/35811585>