[EasyUnlock] Serialize and store BeaconSeeds along as cryptohome key metadata.

chrome/browser/chromeos/login/easy_unlock/easy_unlock_types.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 CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_TYPES_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_TYPES_H_
 
 #include <string>
 #include <vector>
+#include "base/values.h"
 
 namespace chromeos {
 
 extern const char kEasyUnlockKeyMetaNameBluetoothAddress[];
 extern const char kEasyUnlockKeyMetaNameBluetoothType[];
 extern const char kEasyUnlockKeyMetaNamePsk[];
 extern const char kEasyUnlockKeyMetaNamePubKey[];
 extern const char kEasyUnlockKeyMetaNameChallenge[];
 extern const char kEasyUnlockKeyMetaNameWrappedSecret[];
+extern const char kEasyUnlockKeyMetaNameSerializedBeaconSeeds[];
 
 // Device data that is stored with cryptohome keys.
 struct EasyUnlockDeviceKeyData {
   // The Bluetooth type. By default, the assumed type is BLUETOOTH_CLASSIC.
   enum BluetoothType { BLUETOOTH_CLASSIC, BLUETOOTH_LE, NUM_BLUETOOTH_TYPES };
 
   EasyUnlockDeviceKeyData();
   EasyUnlockDeviceKeyData(const EasyUnlockDeviceKeyData& other);
   ~EasyUnlockDeviceKeyData();
 
   // Bluetooth address of the remote device.
   std::string bluetooth_address;
   // The Bluetooth type to connect to the device.
   BluetoothType bluetooth_type;
   // Public key of the remote device.
   std::string public_key;
   // Key to establish a secure channel with the remote device.
   std::string psk;
   // Challenge bytes to be sent to the phone.
   std::string challenge;
   // Wrapped secret to mount cryptohome home.
   std::string wrapped_secret;
+  // Serialized BeaconSeeds used to identify this device.
+  std::string serialized_beacon_seeds;
 };
 typedef std::vector<EasyUnlockDeviceKeyData> EasyUnlockDeviceKeyDataList;
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_EASY_UNLOCK_EASY_UNLOCK_TYPES_H_