[watchman] log parse errors
[watchman] log parse errors

Summary: logs JSON parsing errors with EventLogger

Reviewed By: nmote

Differential Revision: D27709741

fbshipit-source-id: 5bb90945dd1fb7dd19b8c7687e5a7f6847f771d5

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