Re: [whatwg/streams] Add helpers to use initial values of Promise methods (#1010)

ricea commented on this pull request.



> @@ -325,7 +325,7 @@ function TransformStreamDefaultControllerError(controller, e) {
 
 function TransformStreamDefaultControllerPerformTransform(controller, chunk) {
   const transformPromise = controller._transformAlgorithm(chunk);
-  return transformPromise.catch(r => {
+  return PerformPromiseCatch(transformPromise, r => {

We can use PerformPromiseThen() here and it will be closer to [the description in the promises guide](https://www.w3.org/2001/tag/doc/promises-guide/#transforming-by).

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