Private method for internal FBFuture Queue
Private method for internal FBFuture Queue

Summary: This queue is used for mapping and other activities that are an implementation detail. Consolidate this into a method for the sake of controlling this from one place.

Reviewed By: marekcirkos

Differential Revision: D6721271

fbshipit-source-id: 30a2c40a65b6cae9410fea6ea4854417ceb27144

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