To more closely match the behavior of restoring from the page cache if we didn't clear backing stores, we should restore the compositing layers immediately instead of asynchronously (potentially after a layout).
Created attachment 102070 [details] [PATCH] Proposed Fix
Comment on attachment 102070 [details] [PATCH] Proposed Fix Clearing flags on attachment: 102070 Committed r91808: <http://trac.webkit.org/changeset/91808>
All reviewed patches have been landed. Closing bug.