We should scale up our backing store (and repaints, etc.) to match the layer's contentsScale.
Created attachment 214759 [details] patch
Comment on attachment 214759 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=214759&action=review > Source/WebKit2/WebProcess/WebPage/mac/RemoteLayerBackingStore.h:59 > + WebCore::IntRect flipRectForCoordinateSystem(const WebCore::IntRect) const; "for coördinate system" sounds a bit weird. Maybe "mapToContentCoordinates" or something?
http://trac.webkit.org/changeset/157728