Marc Horowitz d7a2d3a957 Add API for sync function calls
Reviewed By: javache

Differential Revision: D3897526

fbshipit-source-id: cadead316996ca7c1dd2b0d60d87945f5452640c
2016-09-26 16:14:11 -07:00
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2016-09-26 16:14:11 -07:00