Re: [whatwg/streams] Add two demos using streams for PNG manipulation (#911)

ricea commented on this pull request.



> @@ -25,6 +25,12 @@ <h1>Streams Demos</h1>
 
   <dt><a href="https://fetch-progress.anthum.com/">Progress indicators with Service Workers and Fetch</a> | <a href="https://github.com/AnthumChris/fetch-progress-indicators">(Source Code)</a>
   <dd>Streams intercept Service Worker <code>FetchEvent</code> and <code>fetch()</code> statements to show progress indicators. See <a href="https://github.com/AnthumChris/fetch-progress-indicators#browser-support">browser support</a> notes.
+
+  <dt><a href="http://mdn.github.io/dom-examples/streams/grayscale-png/">Grayscale a PNG</a> | <a href="https://github.com/mdn/dom-examples/tree/master/streams/grayscale-png">(Source Code)</a>
+  <dd>A PNG gets fetched to receive a ReadableStream on it, than the PNG data is converted to black and white and enqueued into another ReadableStream.

Could you update this comment to indicate that it uses TransformStream?

Also, in the demo itself, it would nice if it displayed a message in the page when TransformStream is not defined, to avoid confusion.

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