Disable it for now in r68431. Need to investigate this weird failure. http://test-results.appspot.com/dashboards/flakiness_dashboard.html#useWebKitCanary=true&tests=fast%2Fcanvas%2Fwebgl%2Fobject-deletion-behaviour.html
I did some testing, and it turns out to be a mesa bug. I filed it to mesa: https://bugs.freedesktop.org/show_bug.cgi?id=30993 In the meantime, I'll do a work-around to get the test pass.
Created attachment 71216 [details] patch This fix is to work around the mesa bug, but it is good/correct behavior anyway. Tested, with this fix, the test will pass with mesa backend.
Comment on attachment 71216 [details] patch OK.
Comment on attachment 71216 [details] patch Clearing flags on attachment: 71216 Committed r70663: <http://trac.webkit.org/changeset/70663>
All reviewed patches have been landed. Closing bug.
http://trac.webkit.org/changeset/70663 might have broken GTK Linux 32-bit Debug