Command line flags enable-legacy-accelerated-2d-canvas and enable-accelerated-drawing must be added to the DumpRenderTree tool.
Created attachment 92241 [details] Patch
Comment on attachment 92241 [details] Patch Looks good to me.
Comment on attachment 92241 [details] Patch Clearing flags on attachment: 92241 Committed r85777: <http://trac.webkit.org/changeset/85777>
All reviewed patches have been landed. Closing bug.