It can be called several time quickly in which case, it might execute several time the same callback.
<rdar://problem/38875651>
Created attachment 339273 [details] Patch
Comment on attachment 339273 [details] Patch Attachment 339273 [details] did not pass win-ews (win): Output: http://webkit-queues.webkit.org/results/7534224 New failing tests: http/tests/security/canvas-remote-read-remote-video-blocked-no-crossorigin.html
Created attachment 339284 [details] Archive of layout-test-results from ews202 for win-future The attached test failures were seen while running run-webkit-tests on the win-ews. Bot: ews202 Port: win-future Platform: CYGWIN_NT-6.1-2.9.0-0.318-5-3-x86_64-64bit
Comment on attachment 339273 [details] Patch Clearing flags on attachment: 339273 Committed r231234: <https://trac.webkit.org/changeset/231234>
All reviewed patches have been landed. Closing bug.