Expose PolyUtil.locationIndexOnEdgeOrPath()

[thiagotalma]

It would be very useful to follow this tip: #147 (comment)

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[thiagotalma]

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

I signed it!

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CLAs look good, thanks!

[stephenmcd]

Thanks!