I found two assertion failures while running AC(clutter backend) test page in debug build.
Created attachment 179496 [details] Patch
Comment on attachment 179496 [details] Patch Attachment 179496 [details] did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/15313771 New failing tests: inspector-protocol/debugger-terminate-dedicated-worker-while-paused.html
Comment on attachment 179496 [details] Patch Attachment 179496 [details] did not pass mac-ews (mac): Output: http://queues.webkit.org/results/15309778 New failing tests: fast/frames/sandboxed-iframe-attribute-parsing.html
Created attachment 179737 [details] Patch
Comment on attachment 179737 [details] Patch Makes sense, but can you add notImplemented() calls for the AcceleratedCompositingContext methods you removed the asserts from?
Created attachment 179945 [details] Patch
Comment on attachment 179945 [details] Patch Clearing flags on attachment: 179945 Committed r138100: <http://trac.webkit.org/changeset/138100>
All reviewed patches have been landed. Closing bug.