Address two possible causes of missing tiles in iOS Safari, and add logging to gather more data about other possible causes
Created attachment 344392 [details] Patch
Created attachment 344398 [details] Patch
Comment on attachment 344398 [details] Patch Attachment 344398 [details] did not pass mac-wk2-ews (mac-wk2): Output: https://webkit-queues.webkit.org/results/8452466 New failing tests: imported/w3c/web-platform-tests/service-workers/service-worker/fetch-canvas-tainting-cache.https.html
Created attachment 344400 [details] Archive of layout-test-results from ews104 for mac-sierra-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: ews104 Port: mac-sierra-wk2 Platform: Mac OS X 10.12.6
Comment on attachment 344398 [details] Patch Clearing flags on attachment: 344398 Committed r233561: <https://trac.webkit.org/changeset/233561>
All reviewed patches have been landed. Closing bug.
<rdar://problem/41878797>