[w3c/payment-request] Attach 'payment request is showing boolean' to top-level browsing context (#811)

closes #809

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec errors/warnings.
 * [ ] Modified Web platform tests (link)
 * [ ] Modified MDN Docs (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] [Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=1469419)
 * [ ] Edge (public signal)

Optional, impact on Payment Handler spec?

Yes. Payment Handlers might need to have a means of keeping track of open payment sheets. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/811

-- Commit Summary --

  * Attach 'payment request is showing boolean' to top-level browsing context

-- File Changes --

    M index.html (69)

-- Patch Links --

https://github.com/w3c/payment-request/pull/811.patch
https://github.com/w3c/payment-request/pull/811.diff

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