[EasyUnlock] Add a private API for establishing an insecure Bluetooth connection.

device/bluetooth/bluetooth_device_chromeos.h

Index: device/bluetooth/bluetooth_device_chromeos.h
diff --git a/device/bluetooth/bluetooth_device_chromeos.h b/device/bluetooth/bluetooth_device_chromeos.h
index 6f335603cd630f73abc171d6a1a2b5c65e904d24..85ed0709a39d4c7a68fd1004e53e58cfb8527615 100644
--- a/device/bluetooth/bluetooth_device_chromeos.h
+++ b/device/bluetooth/bluetooth_device_chromeos.h
@@ -73,6 +73,19 @@ class BluetoothDeviceChromeOS
       const base::Closure& callback,
       const ErrorCallback& error_callback) OVERRIDE;
 
+  // Attempts to initiate an insecure outgoing L2CAP or RFCOMM connection to the
+  // advertised service on this device matching |uuid|, performing an SDP lookup
+  // if necessary to determine the correct protocol and channel for the
+  // connection. Unlike ConnectToService, the outgoing connection will request
+  // no bonding rather than general bonding. |callback| will be called on a
+  // successful connection with a BluetoothSocket instance that is to be owned
+  // by the receiver. |error_callback| will be called on failure with a message
+  // indicating the cause.
+  void ConnectToServiceInsecurely(
+    const device::BluetoothUUID& uuid,
+    const ConnectToServiceCallback& callback,
+    const ConnectToServiceErrorCallback& error_callback);
+
   // Creates a pairing object with the given delegate |pairing_delegate| and
   // establishes it as the pairing context for this device. All pairing-related
   // method calls will be forwarded to this object until it is released.