Changes

; Description

: This is an asynchronous method and its result is returned via a Promise. Once the method is called, property [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#connectionState|connectionState]] becomes <tt>connecting</tt> and a corresponding [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#onconnectionstatechanged|onconnectionstatechanged]] would be triggered. If the connect operation succeeds, another [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#onconnectionstatechanged|onconnectionstatechanged]] would be triggered before the Promise is resolved to indicate property [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGatt#connectionState|connectionState]] becomes <tt>connected</tt>.