Re: [w3c/FileAPI] Add simpler reading methods to Blob interface. (#117)

annevk commented on this pull request.



> +It must return the result of [=getting a stream for a Blob=] for the [=context object=].
+
+To <dfn lt="get a stream for a Blob|getting a stream for a Blob">get a stream for a {{Blob}}</dfn>
+|blob|, run the following steps:
+
+1. Let |stream| be the result of [=construct a ReadableStream object|constructing=] a
+   {{ReadableStream}} object.
+1. Return |stream| and run the following steps [=in parallel=]:
+  1. While not all bytes of |blob| have been read:
+    1. Let |bytes| be the byte sequence that results from reading a [=chunk=] from |blob|.
+    1. If a [=file read error=] occured while reading |bytes|, [$ReadableStream/error$]
+       |stream| with a [=failure reason=] and abort these steps.
+    1. [=ReadableStream/Enqueue=] |bytes| into |stream|.
+
+    Issue: We need to specify more concretely what reading from a Blob actually does, and what
+    possible errors can happen.

It uses https://fetch.spec.whatwg.org/#concept-read-chunk-from-readablestream. As I mentioned in the other issue though there are some problems with how the abstraction works.

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