Hedger Wang 614f3c68e6 Add NavigationStateUtils.back() and NavigationStateUtils.forward().
Summary: This makes it easy to build Pager.

Reviewed By: ericvicenti

Differential Revision: D3479979

fbshipit-source-id: 71c0536eb190e8ad64feea99e4bda5e2d28801d2
2016-06-24 15:28:35 -07:00
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