[cros] Display emails of users are stored in a separate dictionary in Local State.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

 // Copyright (c) 2011 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_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 70 matching lines @@
 
   // Returns users list to be shown.
   virtual const UserList& GetUsers() const = 0;
 
   // Whether login as guest is available.
   virtual bool IsShowGuest() const = 0;
 
   // Whether new user pod is available.
   virtual bool IsShowNewUser() const = 0;
 
+  // Sets the displayed email for the next login attempt. If it succeeds,
+  // user's displayed email value will be updated to |email|.
+  virtual void SetDisplayEmail(const std::string& email) = 0;
+
  protected:
   virtual ~SigninScreenHandlerDelegate() {}
 };
 
 // A class that handles the WebUI hooks in sign-in screen in OobeDisplay
 // and LoginDisplay.
 class SigninScreenHandler : public BaseScreenHandler,
                             public LoginDisplayWebUIHandler,
                             public BrowsingDataRemover::Observer,
                             public SystemKeyEventListener::CapsLockObserver {
@@ skipping 153 matching lines @@
 
   // CapsLock state change notifier instance;
   SystemKeyEventListener* key_event_listener_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_SIGNIN_SCREEN_HANDLER_H_