Currently, they are always using first party partitions
Created attachment 335395 [details]
Attachment 335395 [details] did not pass style-queue:
ERROR: Source/WebCore/workers/service/context/ServiceWorkerThread.cpp:74: Missing spaces around : [whitespace/init] 
Total errors found: 1 in 7 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 335395 [details]
Clearing flags on attachment: 335395
Committed r229483: <https://trac.webkit.org/changeset/229483>
All reviewed patches have been landed. Closing bug.