Based on a WebKit request we added names to dedicated workers in HTML: https://github.com/whatwg/html/pull/2664. Tests at http://w3c-test.org/workers/name-property.html (and http://w3c-test.org/workers/shared-worker-name-via-options.html for shared workers, although I guess that's not applicable to WebKit). The actual spec PR was merged a bit prematurely; multiple vendors were on board with the idea, but not everyone got a chance to review the final proposed API shape. So if there are objections please let us know and we can revise the spec or revert it.
<rdar://problem/32201464>
Note that we just changed the spec to make it [Replaceable], to avoid compatibility problem Firefox discovered while implementing. The tests are updated to reflect this minor change.
Oops, I opened a new bug for this. *** This bug has been marked as a duplicate of bug 188779 ***