Add structs for stream declared exception tests
Add structs for stream declared exception tests

Summary: title

Reviewed By: Alfus

Differential Revision: D40462161

fbshipit-source-id: 13a5f12ed7197bead9a811f5962283a978e80d82

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