Re: [w3c/clipboard-apis] Defer OS clipboard read from clipboard.read() to ClipboardItem.getType() (PR #248)

@shwetabin commented on this pull request.



> +
+     1. If |representation|'s [=representation/data=] is not yet resolved, run the following steps [=in parallel=]:
+
+      Note: When a {{ClipboardItem}} is obtained from {{Clipboard/read()}}, its [=representation/data=] is initialized to an unresolved promise so that the OS clipboard read can be deferred to this point.
+
+      1. If |isCustom| is true, then:
+
+       1. Let |webCustomFormatMap| be the [=os specific custom map name=].
+
+       1. Read |webCustomFormatMap| from the [=system clipboard=].
+
+       1. Let |webCustomFormatMapString| be the JSON string deserialized from |webCustomFormatMap|.
+
+       1. Let |osFormatName| be the value in |webCustomFormatMapString| whose key matches |mimeType| [=serialize a MIME type|serialized=].
+
+       1. If |osFormatName| is not found, then [=queue a global task=] on the [=clipboard task source=], given |realm|'s [=realm/global object=], to [=reject=] |p| with a {{"NotFoundError"}} {{DOMException}} in |realm|, then abort these steps.

To clarify, |p| is the promise created by getType() (step 5), not by read(). The return |p| in the stale-data check exits the getType() method entirely, so the React to representationDataPromise steps are never reached in that case.

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