Re: [web-bluetooth] Have sites explicitly watch for advertisements on paired devices.

Thank you for spec'ing this @jyasskin!

Here are my two cents: Do we really need the added this new boolean 
attribute `watchingAdvertisements`? Can't we simply set it internally 
to true when developer calls 
`device.addEventListener('advertisementreceived', foo);`?

It would be as simple and nice as:
```js
var known_service = "A service in the iBeacon’s GATT server";
return navigator.bluetooth.requestDevice({
  filters: [{services: [known_service]}]
}).then(device => {
  // Set `watchingAdvertisements` to true
  device.addEventListener('advertisementreceived', interpretIBeacon);
});

// Later on...
// Set `watchingAdvertisements` to false
device.removeEventListener('advertisementreceived', interpretIBeacon);

```

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Received on Wednesday, 4 May 2016 07:03:05 UTC