Add chrome.bluetooth and chrome.bluetoothLowEnergy for android

Yes. The bluetooth adapter does not works well when I tried to connect to multiple devices at same time (beacons and peripheral). I need to restart my bluetooth adapter to make them works again.

[This question](http://stackoverflow.com/questions/21237093/android-4-3-how-to-connect-to-multiple-bluetooth-low-energy-devices) also mentions sequentially connect & register notification.