Re: [dom] High resolution timing for events (#23)

"Lots and lots of sites" has not been our experience.  But as with anything compat, data trumps anecdote here.  @majido, can you share your analysis from httparchive data?

FWIW I argued ages ago for a new Event `systemTime` property, and we went [around](https://lists.w3.org/Archives/Public/public-web-perf/2012Oct/0046.html)-and-[around](https://lists.w3.org/Archives/Public/public-web-perf/2014Jan/0019.html) for years and couldn't get it spec'd anywhere due to constant debate about whether it was better to add a new property or fix the old one.  Firefox never implemented the UNIX-epoch version, so felt it was already largely web compatible and understandably didn't want to regress to using wall-times in a property that was already (rightly) monotonic for them.

So attempting to ship a breaking change in Chrome was our compromise.  So far it's hit Chrome beta with millions of users and very little fallout, so we have no reason to pull the plug yet.

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