Re: [dom] Should EventInit contain 'timestamp'? (#76)

Sorry, let's back up a second, I may be jumping to conclusions based on partial discussions elsewhere.  Filed #80 to track the larger issue.

If we decide to do that, then `timestamp` is no longer an inherent property of the event, but data supplied by the thing that created the event, and as you've argued elsewhere (`TouchEvent.pageX` I think?) all such properties should be settable via the constructor.

Eg. imagine a PointerEvents polyfill that generates `pointermove` events from `mousemove` and `touchmove`.  If `timestamp` represents the time the input was first received by the OS, then the polyfill should be able to propagate the value from a `mousemove` into a generated `pointermove`.  There are other similar non-polyfill scenarios involving any synthetic input event.

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