Re: [streams] Make the context be the transform object when calling transform and flush (#356)

> @@ -367,3 +367,25 @@ test('TransformStream flush gets a chance to enqueue more into the readable, and
>    })
>    .catch(e => t.error(e));
>  });
> +
> +test('Transform context', t => {

Needs to test flush as well.

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