Refactor user pods to use authType property for distinct authentication modes.

chrome/browser/chromeos/login/screen_locker.h

Index: chrome/browser/chromeos/login/screen_locker.h
diff --git a/chrome/browser/chromeos/login/screen_locker.h b/chrome/browser/chromeos/login/screen_locker.h
index d2dbcd5c348e9dc6a83efbc8fbb05aecbc1fd10a..34a09de6bbe2e3a4d00efb8aefc165725654a4e2 100644
--- a/chrome/browser/chromeos/login/screen_locker.h
+++ b/chrome/browser/chromeos/login/screen_locker.h
@@ -14,6 +14,7 @@
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
+#include "chrome/browser/chromeos/login/login_display.h"
 #include "chrome/browser/chromeos/login/login_status_consumer.h"
 #include "chrome/browser/chromeos/login/screen_locker_delegate.h"
 #include "chrome/browser/chromeos/login/user.h"
@@ -89,6 +90,17 @@ class ScreenLocker : public LoginStatusConsumer {
                          const gfx::Image& icon,
                          const base::Closure& click_callback);
 
+  // Hides the user pod button for a user.
+  void HideUserPodButton(const std::string& username);
+
+  // Set the authentication type to be used on the lock screen.
+  void SetAuthType(const std::string& username,
+                   LoginDisplay::AuthType auth_type,
+                   const std::string& initial_value);
+
+  // Returns the authentication type used for |username|.
+  LoginDisplay::AuthType GetAuthType(const std::string& username) const;
+
   // Disables all UI needed and shows error bubble with |message|.
   // If |sign_out_only| is true then all other input except "Sign Out"
   // button is blocked.