[w3c/clipboard-apis] What happens if promises to Blobs are not resolved within a reasonable amount of time? (Issue #161)

`ClipboardItem` has `ClipboardItemDataType`  which is a `Promise` to `Blob or DOMString`. When web authors don't resolve these promises in a reasonable amount of time, what should the Browser do in that case? Also, what happens if the promises to Blobs are resolved after the Browser Window loses focus? or user switches to another tab (while the promises are still not resolved in the first tab), opens the same site and starts another copy? Should we add a check to verify if the `Document` is active or not after the promises are resolved and before we write the payload to the clipboard?
@whsieh @mbrodesser @BoCupp-Microsoft @mkruisselbrink 

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