Add RemoteDeviceLoader to create RemoteDevice from CryptAuth data.

components/proximity_auth/remote_device.h

 // Copyright 2014 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 COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_H
 #define COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_H
 
 #include <string>
 
 namespace proximity_auth {
 
 struct RemoteDevice {
  public:
+  enum BluetoothType { BLUETOOTH_CLASSIC, BLUETOOTH_LE };
+
+  std::string user_id;
   std::string name;
   std::string public_key;
+  BluetoothType bluetooth_type;
   std::string bluetooth_address;
   std::string persistent_symmetric_key;
+  std::string sign_in_challenge;
 
   RemoteDevice();
-  RemoteDevice(const std::string& name,
+  RemoteDevice(const std::string& user_id,
+               const std::string& name,
                const std::string& public_key,
+               BluetoothType bluetooth_type,
                const std::string& bluetooth_address,
-               const std::string& persistent_symmetric_key);
+               const std::string& persistent_symmetric_key,
+               std::string sign_in_challenge);
   ~RemoteDevice();
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_H