[w3c/manifest] Payment Handler spec defines IDL types very similar to manifest (#652)

ie.

Manifest: https://www.w3.org/TR/appmanifest/#imageresource-and-its-members
```
dictionary ImageResource {
    required USVString src;
             DOMString sizes;
             USVString type;
             USVString purpose;
             USVString platform;
};
```

Payment Handler: https://w3c.github.io/payment-handler/#dom-imageobject
```
dictionary ImageObject {
    required USVString src;
             DOMString sizes;
             DOMString type;
};
```

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