Add StreamPublisher example to streamlowlevel
Add StreamPublisher example to streamlowlevel

Reviewed By: iahs

Differential Revision: D19053356

fbshipit-source-id: 47f08d071c4adaf301a31a227853200fac137288

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift