Hedger Wang 4763f89efa update NavigationContext API.
Summary: 1. Add a new api `top` which returns the root navigator of a nested navigator.
2. Remove the param `context` from the method `addListener` because it's not used and not necessary.

public

Reviewed By: fkgozali

Differential Revision: D2613852

fb-gh-sync-id: 0d5544422ff0be7875824989a4fbefbef9aac986
2015-11-03 19:08:31 -08:00
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2015-11-03 19:08:31 -08:00
2015-07-24 13:16:25 -08:00