[chore] helper method for sending lsp request server -> client
[chore] helper method for sending lsp request server -> client

Reviewed By: vrama628

Differential Revision: D26580930

fbshipit-source-id: 0b945cfee0c54537e8acb1ff1036bbcb055ac760

mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,mroch/flow