Summary: Currently for a dedicated worker, we set its 0 time for
performance.now() purposes to the zero time of its parent worker or
window. The spec defines a different behavior, now that there is a spec
for this. Consumers that rely on the timebases matching right now can
use translateTime instead.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1226147
Spec: http://w3c.github.io/hr-time/
Target release: 45
State in other UAs: Chrome plans to implement, unclear on the others.
One of IE and Safari (can't recall which one) doesn't even implement
performance.now() in workers.
-Boris
P.S. I'm not doing the impl work, just the paperwork.
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