It may be time to activate fetch API runtime flag by default.
Created attachment 285112 [details] Patch
almost. Let's land a few of your other patches first.
Comment on attachment 285112 [details] Patch let's do this
Comment on attachment 285112 [details] Patch Clearing flags on attachment: 285112 Committed r204705: <http://trac.webkit.org/changeset/204705>
All reviewed patches have been landed. Closing bug.
Since fetch API requires readablestream but not writablestream, and since writablestream is less mature and stable than readable stream, bug 161044 is adding a separate compile flag for readablestream and writablestream. This allows shipping one and not the other. Note also that fetch API without streams API is not very well tested.