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Fix iOS last up event velocity calculation - version 3 (#11571)

* Add synthesized property to pointer events

* test
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xster committed
c9b0b3bb0301e8a999374ed4330a0d0af42a54aa
Parent: 680d581
Committed by GitHub <noreply@github.com> on 8/10/2017, 12:39:59 AM