[w3ctag/spec-reviews] PaymentRequest.canMakeActivePayment() (#146)

Hello TAG!

I'm requesting a TAG review of:

  - Name: PaymentRequest.canMakeActivePayment()
  - Explainer: https://github.com/zkoch/zkoch.github.io/blob/master/pr-detect-avail.md
  - Example code: http://rsolomakhin.github.io/pr/pr.js
```javascript
    var request = new PaymentRequest(supportedPaymentMethods, shoppingCartContents);
    if (request.canMakeActivePayment) {
      request.canMakeActivePayment().then(result => {
        console.log(result ? "Can make active payment" : "Cannot make active payment");
      }).catch(err => {
        console.log(err);
      });
    }
```
  - Primary contacts: @rsolomakhin and @zkoch

Further details:

  - Relevant time constraints or deadlines: Would like to ship [patch](http://crrev.com/2467393002) in Chrome M56.

You should also know that...

[please tell us anything you think is relevant to this review]

We'd prefer the TAG provide feedback as (please select one):

  - [ ] open issues in our Github repo for each point of feedback
  - [ ] open a single issue in our Github repo for the entire review
  - [x] leave review feedback as a comment in this issue and @-notify @rsolomakhin and @zkoch

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