Re: [ServiceWorker] Is fetchEvent.client a performance concern? (#723)

So, it's time to add `FetchEvent.clientId`, a sync attribute's getter, and an API to get a `Client` object by id. How about:

```js
onfetch = e => {
  clients.getClient(e.clientId).then(c => {
    c.postMessage("to the request's client.");
  });
};
```

Open to another name for `.getClient(id)` method.

@jakearchibald could you give more info about "race conditions to sort in terms of onmessage listeners"? Is it a separate issue or directly related to defining these attribute/method?

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