We have only been including the root layer in screen captures. We need to include accelerated layers as well.
Created attachment 195152 [details] Patch
Created attachment 195155 [details] Patch
Comment on attachment 195155 [details] Patch LGTM.
Comment on attachment 195155 [details] Patch Clearing flags on attachment: 195155 Committed r146934: <http://trac.webkit.org/changeset/146934>
All reviewed patches have been landed. Closing bug.