Re: [touch-events] TouchInit should perhaps include pageX and pageY (#28)

I was all set to add these, but then Anne mentioned on another thread somewhere (that I can't find) that he's no longer convinced of the above comment.  Anne, what's your current guidance here?  Should event initializers be dumb structs that initialize every property (even when the values are technically not self consistent), or should the constructors be smart enough to initialize derived properties from the values of other properties?

Note that @choniong is in the process of adding these constructors to blink now.

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