Use a stable device-user identifier for CryptAuth enrollments.

chrome/browser/signin/easy_unlock_service.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_SIGNIN_EASY_UNLOCK_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 61 matching lines @@
 
   // Registers Easy Unlock local state entries.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // Removes the hardlock state for the given user.
   static void ResetLocalStateForUser(const std::string& user_id);
 
   // Returns the user's preferences.
   static UserSettings GetUserSettings(const std::string& user_id);
 
+  // Returns the identifier for the device.
+  static std::string GetDeviceId();
+
   // Returns true if Easy sign-in is enabled.
   static bool IsSignInEnabled();
 
   // Returns the EasyUnlockService type.
   virtual Type GetType() const = 0;
 
   // Returns the user currently associated with the service.
   virtual std::string GetUserEmail() const = 0;
 
   // Launches Easy Unlock Setup app.
@@ skipping 203 matching lines @@
   bool tpm_key_checked_;
 
   ObserverList<EasyUnlockServiceObserver> observers_;
 
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_