Add CryptAuth managers to EasyUnlockServiceRegular

components/proximity_auth/cryptauth/cryptauth_enrollment_utils.h

 // Copyright 2015 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_CRYPT_AUTH_ENROLLMENT_UTILS_H
 #define COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_ENROLLMENT_UTILS_H
 
 #include <string>
 
 namespace proximity_auth {
 
 // Calculates an id for the specified user on the specified device.
 std::string CalculateDeviceUserId(const std::string& device_id,
                                   const std::string& user_id);
 
+// Hashes |string| to an int64 value. These int64 hashes are used to fill the
+// GcmDeviceInfo proto to upload to CryptAuth.
+int64_t HashStringToInt64(const std::string& string);
+
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_ENROLLMENT_UTILS_H