Re: [w3c/ServiceWorker] Promise on navigator.serviceWorker that resolves when page is controlled (#799)

> For people who're reading this now (through Google search), the `workbox-window` package now includes `active` and `controlling` promises which can be used.
> 
> Usage:
> 
> ```
> // somewhere
> import {Workbox} from 'workbox-window';
> const workbox = new Workbox('/service-worker.js');
> 

Thank you for this. I'm still testing but this seems to work for me. On the first page load it waits for the 'controlling' event and then on subsequent loads will look for the controller being set. 

```
    if ('serviceWorker' in navigator) {

        const wb = new Workbox(`./sw.js`)

        if (navigator.serviceWorker.controller) {
            startApp()
        } else {
            wb.addEventListener('controlling', e => {
                startApp()
            })
        }

        wb.register()

    }


```


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