[w3c/payment-handler] [WIP] showPaymentUI() method (#325)

closes #299, #300 

The following tasks have been completed:

 * [ ] web platform tests (link)
 * [ ] MDN Docs added (link)

Implementation commitment:

 * [ ] Safari (link to issue)
 * [ ] Chrome (link to issue)
 * [ ] Firefox (link to issue)
 * [ ] Edge (public signal)


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<a href="https://pr-preview.s3.amazonaws.com/romandev/payment-handler/pull/325.html" title="Last updated on Sep 24, 2018, 2:57 PM GMT (8b845be)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/payment-handler/325/697480d...romandev:8b845be.html" title="Last updated on Sep 24, 2018, 2:57 PM GMT (8b845be)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-handler/pull/325

-- Commit Summary --

  * Add showPaymentUI() method

-- File Changes --

    M index.html (122)

-- Patch Links --

https://github.com/w3c/payment-handler/pull/325.patch
https://github.com/w3c/payment-handler/pull/325.diff

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