Summary: A new method on Performance that allows translating a timestamp
from one timeline to another. The idea is that you can take a
performance.now() value or performance mark from some other global and
convert them to the timeline of your global. It works like this:
var myTime = Performance.translateTime(otherTime, otherGlobal);
where otherGlobal is a Window, Worker, SharedWorker, or ServiceWorker.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1169068
Spec: http://w3c.github.io/hr-time/
Target release: 45
State in other UAs: Chrome plans to implement, unclear on the others.
-Boris
P.S. I'm not doing the impl work, just the paperwork.
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