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

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index ce56ac966fe541e9a349a233f5836e19993d00c7..f3d543ee44563fd1de02038e77d3d3128d9329e6 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -66,6 +66,7 @@ class ExistingUserController : public LoginDisplay::Delegate,
   virtual void CreateAccount() OVERRIDE;
   virtual string16 GetConnectedNetworkName() OVERRIDE;
   virtual void FixCaptivePortal() OVERRIDE;
+  virtual void SetDisplayEmail(const std::string& email) OVERRIDE;
   virtual void CompleteLogin(const std::string& username,
                              const std::string& password) OVERRIDE;
   virtual void Login(const std::string& username,
@@ -202,6 +203,9 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Whether it's first login to the device and this user will be owner.
   bool is_owner_login_;
 
+  // The displayed email for the next login attempt set by |SetDisplayEmail|.
+  std::string display_email_;
+
   FRIEND_TEST_ALL_PREFIXES(ExistingUserControllerTest, NewUserLogin);
 
   DISALLOW_COPY_AND_ASSIGN(ExistingUserController);