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

@ricea commented on this pull request.



> + 1. Let |writable| be a [=new=] {{WritableStream}}.
+ 1. Perform ! [$SetUpCrossRealmTransformWritable$](|writable|, |port1|).
+ 1. Let |promise| be ! [$ReadableStreamPipeTo$](|value|, |writable|, false, false, false, undefined).
+ 1. Set |promise|.\[[PromiseIsHandled]] to true.
+ 1. Let |messagePortDataHolder| be { \[[Type]]: `"MessagePort"` }.
+ 1. Perform {{MessagePort}}'s transfer steps <!-- TODO(ricea): Link this somehow --> with |port2|
+    and |messagePortDataHolder|.
+ 1. Set |dataHolder|.\[[port]] to |messagePortDataHolder|.
+
+</div>
+
+<div algorithm="ReadableStream transfer receiving steps">
+Their [=transfer-receiving steps=], given |dataHolder| and |value|, are:
+
+ 1. Let |port| be a new {{MessagePort}}.
+ 1. Perform {{MessagePort}}'s transfer-receiving steps with |dataHolder|.\[[port]] and |port|.

Done.

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