CryptAuth: Add GetId() and a GetTruncatedIdForLogs() functions to RemoteDevice.

components/cryptauth/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>
 #include <vector>
 
@@ skipping 14 matching lines @@
   RemoteDevice();
   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,
                std::string sign_in_challenge);
   RemoteDevice(const RemoteDevice& other);
   ~RemoteDevice();
+
+  // Returns a unique ID for the device.
+  std::string GetDeviceId();
+
+  // Returns a shortened device ID for the purpose of concise logging (device
+  // IDs are often so long that logs are difficult to read). Note that this
+  // ID is not guaranteed to be unique, so it should only be used for log.
+  std::string GetTruncatedDeviceIdForLogs();
 };
 
 typedef std::vector<RemoteDevice> RemoteDeviceList;
 
 }  // namespace cryptauth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_H