Introduce SessionManager that will contain code to start user session on Chrome OS

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

Index: chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h
index 7364463a88bc297b56f20b05e158139f414257ed..a7928b2871e30f074b77a28db06da6cfd47b8c2d 100644
--- a/chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/reset_screen_handler.h
@@ -14,6 +14,8 @@
 #include "chromeos/dbus/update_engine_client.h"
 #include "content/public/browser/web_ui.h"
 
+class PrefRegistrySimple;
+
 namespace chromeos {
 
 // WebUI implementation of ResetScreenActor.
@@ -43,6 +45,9 @@ class ResetScreenHandler : public ResetScreenActor,
 
   void OnRollbackCheck(bool can_rollback);
 
+  // Registers Local State preferences.
+  static void RegisterPrefs(PrefRegistrySimple* registry);
+
  private:
   // JS messages handlers.
   void HandleOnCancel();