Experiment with a map for associating objects with ByteBuffers #13656
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This map could be used to associate an object with a ByteBuffer for tunneling through APIs that only take ByteBuffer. For example, and implementation supporting transferTo could associate a particular Content.Source with an empty buffer and write that to a Sink. If the ultimate implementation of the sink takes the source and uses it, then no more writes are necessary, otherwise the content has to be written normally.
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This map could be used to associate an object with a ByteBuffer for tunneling through APIs that only take ByteBuffer. For example, and implementation supporting transferTo could associate a particular Content.Source with an empty buffer and write that to a Sink. If the ultimate implementation of the sink takes the source and uses it, then no more writes are necessary, otherwise the content has to be written normally (i.e. as an alternative mechanism for #13631)