Add API file for 26
Add API file for 26

Reviewed By: emma0303

Differential Revision: D19520991

fbshipit-source-id: 5dacf479639f10ff2778b2f9486cf9a2500b05e8

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex