Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

@ricea commented on this pull request.



> +
+  <p>The transferred stream can be used exactly like the original. Its [=readable side|readable=]
+  and [=writable sides=] will become locked and no longer directly usable.
+ </dd>
+</dl>
+
+<div algorithm="TransformStream transfer steps">
+ {{TransformStream}} objects are [=transferable objects=]. Their [=transfer steps=], given |value|
+ and |dataHolder|, are:
+
+ 1. Let |readable| be |value|.\[[readable]].
+ 1. Let |writable| be |value|.\[[writable]].
+ 1. If ! [$IsReadableStreamLocked$](|readable|) is true, throw a "{{DataCloneError}}"
+    {{DOMException}}.
+ 1. If ! [$IsWritableStreamLocked$](|writable|) is true, throw a "{{DataCloneError}}"
+    {{DOMException}}.

I've updated the tests to test this feature (which is missing from Blink's implementation 😳).

I don't feel I need to call attention to the feature with a note, as it is just a matter of polish.

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