Make sure childContainmentLayer is parented
Created attachment 227904 [details] Patch
Comment on attachment 227904 [details] Patch We should fix the UI-side compositing confusion too (never send a layer creation until it's actually in the tree?)
Or maybe always send changes for unparented layers? We might want to send unparented tiles at some point?
Comment on attachment 227904 [details] Patch Clearing flags on attachment: 227904 Committed r166339: <http://trac.webkit.org/changeset/166339>
All reviewed patches have been landed. Closing bug.