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Oleg Lokhvitsky e0170a9445 Android ScrollView fix for pagingEnabled

Summary:
The snapToOffsets changes improved the flinging algorithm for snapToInterval/snapToOffsets but actually broke it for pagingEnabled because it's meant to only scroll one page at a time.

First, I just brough back the old algorithm, but noticed that it has a bunch of issues (e.g. #20155). So, I tried to improve the algorithm to make sure it uses the proper target offset prediction using the same physics model that Android uses for it's normal scrolling but still be limited to one page scrolls.

This resolves #21116.

Reviewed By: shergin

Differential Revision: D9945017

fbshipit-source-id: be7d4dfd1140f4c4d32bad93a03812dc80286069

2018-09-24 10:22:23 -07:00