This will be sent to the client and passed to a handler in ggvis.messages on
the client side. The handler is specified by type.
| 1 | ggvis_message(session, type, data = NULL, id = NULL)
 | 
| session | A session object. | 
| type | A string representing the type of the message. | 
| data | An object (typically a list) containing information for the client. | 
| id | A unique identifier for ggvis message handler (optional). | 
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