Bluetooth: Add support for pairing display notifications

device/bluetooth/bluetooth_device.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 105 matching lines @@
     // may be authenticated. The DismissDisplayOrConfirm() method will be
     // called to dismiss the display once pairing is complete or cancelled.
     //
     // This is used for Bluetooth 2.1 and later devices that support input
     // but not display, such as keyboards. The Passkey is a numeric in the
     // range 0-999999 and should be always presented zero-padded to six
     // digits.
     virtual void DisplayPasskey(BluetoothDevice* device,
                                 uint32 passkey) = 0;
 
+    // This method will be called when the Bluetooth daemon gets a notification
+    // of a key entered on the device |device| while pairing with the device
+    // using a PIN code or a Passkey.
+    //
+    // This method will be called only after DisplayPinCode() or
+    // DisplayPasskey() is called and before the corresponding
+    // DismissDisplayOrConfirm() is called, but is not warranted to be called
+    // on every pairing process that requires a PIN code or a Passkey because
+    // some device may not support this feature.
+    //
+    // The |entered| value describes the number of keys entered so far,
+    // including the last [enter] key. A first call to KeysEntered() with
+    // |entered| as 0 will be sent when the device supports this feature.
+    virtual void KeysEntered(BluetoothDevice* device,
+                             uint32 entered) = 0;
+
     // This method will be called when the Bluetooth daemon requires that the
     // user confirm that the Passkey |passkey| is displayed on the screen
     // of the device |device| so that it may be authenticated. The delegate
     // should display to the user and ask for confirmation, then call
     // ConfirmPairing() on the device to confirm, RejectPairing() on the device
     // to reject or CancelPairing() on the device to cancel authentication
     // for any other reason.
     //
     // This is used for Bluetooth 2.1 and later devices that support display,
     // such as other computers or phones. The Passkey is a numeric in the
@@ skipping 190 matching lines @@
 
  private:
   // Returns a localized string containing the device's bluetooth address and
   // a device type for display when |name_| is empty.
   string16 GetAddressWithLocalizedDeviceTypeName() const;
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_DEVICE_H_