Avoid doing work at 60fps for tiled layers when not necessary
Created attachment 185111 [details]
Comment on attachment 185111 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=185111&action=review
It seems weird to have a struct with only one member variable, but Simon mentions on IRC that there is a good chance the things a CommitState tracks may grow in the future.
> + (GraphicsLayerCA):