Adding a method BluetoothDevice.isConnected()

Adding a new method to BluetoothDevice that lets callers know whether a remote device is
connected.

Original-patch-by: Jay Civelli <jcivelli@google.com>
Cherry-picked-from: master
Change-Id: Ia8ad2e3189d08b63832634bdf804656b8d013820
2 files changed