Re: [streams] Add socket example. PLEASE REVIEW. (09192f1)

In the up-to-date spec, pull() is invoked whenever:
- the queue is drained (not necessarily emptied)
- a new read request is added to the reaquest queue

So, this should be either:
- set to DEFAULT_WINDOW_SIZE only when `controller.desiredSize` goes up to the given HWM
- set to TCP receive window to a value proportional to `controller.desiredSize`

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