Set this option to 60fps in [WebDisplayLinkHandler initWithMonitor].
Created attachment 298644 [details] Patch
Comment on attachment 298644 [details] Patch Clearing flags on attachment: 298644 Committed r210663: <http://trac.webkit.org/changeset/210663>
All reviewed patches have been landed. Closing bug.
An open source builder had issues with this line. preferredFramesPerSecond isn't declared in a public header or our SPI headers. See https://bugs.webkit.org/show_bug.cgi?id=165897