[web-bluetooth] Describe what happens when an advertising packet is received.

jyasskin has just created a new issue for 
https://github.com/WebBluetoothCG/web-bluetooth:

== Describe what happens when an advertising packet is received. ==
We need to at least update 
[`BluetoothDevice.adData`](http://webbluetoothcg.github.io/web-bluetooth/#idl-def-bluetoothdevice-addata).

See https://github.com/WebBluetoothCG/web-bluetooth/issues/117

Received on Thursday, 21 May 2015 22:53:42 UTC