[w3c/ServiceWorker] determine whether nested frame/iframe have same parent client (#1321)

I've facing a problem that cannot be resolved with current spec, that is determine whether nested frame/iframe have same parent client.

Demo: https://sw-iframe-rowdnkvoih.now.sh

Source: https://gist.github.com/futurist/cb1f5d1ff08df503d36a56a12171e5d1

In this demo, nested iframe want to find the parent `pub.html` to get message and display the exact same message with it's parent `pub.html`, but how to distinguish which `pub.html` iframe is the right parent?

The core part is 

```js
self.clients.matchAll().then(clientList=>{
      const client = clientList.find(c=>c.url.endsWith('pub.html'))
      client.postMessage('sub', [channel.port2])
})
```

I'm thinking of get `clientId` from each request, but every `mode: navigate` request result in empty `clientId`, and break the chain of it's parent.

So here the only way I can find is to `matchAll` and find one, but it's **not right**.

Is this an issue that can be improved?



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