In order to implement a WebKit2 message logging application (bug 54094), we'll need a mechanism for creating a representation of a WebKit2 IPC message suitable for logging. This will probably piggy-back off our message autogeneration code, though we'll also have to think about what to do for messages created via the WK2 API (WKContextPostMessageToInjectedBundle etc.).
<rdar://problem/10317663>