Enable hide animation for login screen.

chrome/browser/chromeos/login/base_login_display_host.h

 // Copyright (c) 2012 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_CHROMEOS_LOGIN_BASE_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_BASE_LOGIN_DISPLAY_HOST_H_
 #pragma once
 
 #include <string>
 
@@ skipping 36 matching lines @@
   virtual void StartWizard(
       const std::string& first_screen_name,
       DictionaryValue* screen_parameters) OVERRIDE;
   virtual void StartSignInScreen() OVERRIDE;
   virtual void ResumeSignInScreen() OVERRIDE;
   virtual void CheckForAutoEnrollment() OVERRIDE;
 
   // Creates specific WizardController.
   virtual WizardController* CreateWizardController() = 0;
 
+  // Called when the first browser window is created, but before it's
+  // ready (shown).
+  virtual void OnBrowserCreated() = 0;
+
   const gfx::Rect& background_bounds() const { return background_bounds_; }
 
  private:
   // content::NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Marks display host for deletion.
   // If |post_quit_task| is true also posts Quit task to the MessageLoop.
@@ skipping 31 matching lines @@
 
   // Used to verify if the device has already been owned.
   scoped_ptr<OwnershipStatusChecker> ownership_status_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseLoginDisplayHost);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_BASE_LOGIN_DISPLAY_HOST_H_