DO NOT MERGE BLE peripheral mode (3/4): Add peripheral mode API.

Add bluetooth adv data, APIs in BluetoothAdpater etc.

Cherry picking ble advertising changes from master to KLP MR2.
b/13137996

Change-Id: Id9d2f566b6d9ed0fffe73b67efad2e3d045360b4

Conflicts:
	core/java/android/bluetooth/BluetoothAdapter.java
	core/java/android/bluetooth/BluetoothGatt.java

Conflicts:
	core/java/android/bluetooth/BluetoothAdapter.java