Takes the first sink in the chain of sinks composed so far, and then chains its message sink in front of the chain already formed.
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The composite sink chain.
The IContributeEnvoySink.GetEnvoySink(MarshalByRefObject, System.Runtime.Remoting.Messaging.IMessageSink) method is used as an optimization to create an envoy sink when the destination is a different context in the same application domain and is used by the Wrap operation.