[w3c/payment-request] Allow payment handlers to report back errors via Payment Request API (PR #1050)

See https://github.com/w3c/payment-request/issues/1040

The following tasks have been completed:

 * [ ] Modified Web platform tests (link)
 
Implementation commitment:

 * [ ] WebKit (link to issue)
 * [ ] Chromium (link to issue)
 * [ ] Gecko (link to issue)

Optional, impact on Payment Handler spec? <-- TBD!


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You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/payment-request/pull/1050

-- Commit Summary --

  * Allow payment handlers to report back errors via Payment Request API

-- File Changes --

    M index.html (66)

-- Patch Links --

https://github.com/w3c/payment-request/pull/1050.patch
https://github.com/w3c/payment-request/pull/1050.diff

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