Capture screenshot during export
Capture screenshot during export

Summary:
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context: https://fb.workplace.com/groups/flippersupport/permalink/804152663398727/

Reviewed By: passy

Differential Revision: D19747718

fbshipit-source-id: 30a06446ba3d7d103332580ab5baad59bbc2481c

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper