Kevin Gozali e7256a777e fix up double surface registration on JS load
Summary:
@public
When JS first starts up, Fabric surface end up double registering itself, causing events to not work. So let's guard it so that registration happens only on reload case.

Reviewed By: shergin

Differential Revision: D8521002

fbshipit-source-id: 441f121786e860dc10e959e940b411c2afaf96dc
2018-06-19 18:47:41 -07:00
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