We should co-opt TileController's prepopulateRect() and perhaps platformCALayerContentsScaleMultiplierForNewTiles to create new tiles live while pinching out.
<rdar://problem/15686848>
Created attachment 232456 [details] patch
Comment on attachment 232456 [details] patch View in context: https://bugs.webkit.org/attachment.cgi?id=232456&action=review > Source/WebCore/WebCore.exp.in:1 > +__ZNK7WebCore18RenderLayerBacking12tiledBackingEv sort!
http://trac.webkit.org/changeset/169576