Re: [w3c/payment-handler] Missing question mark, (#163)

@rsolomakhin,

If a SW client is controlled by an active worker, we can says that the SW client is a controlled client.
(FYI, The SW client can be window client, worker and so on.)

For example, let's imagine that the origin of SW is "https://example.com".
In the SW context,
```
clients.openWindow("https://example.com/abc").then(windowClient => {
    // windowClient is controlled.
});
```

```
clients.openWindow("https://uncontrolled.com").then(windowClient => {
    // this windowClient is not controlled. So, should be null.
});
```

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