Move default_host from LoginDisplayHostImpl to LoginDisplayHost.

chrome/browser/chromeos/login/ui/login_display_host.h

 // Copyright 2014 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_UI_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/callback_list.h"
 #include "chrome/browser/chromeos/customization/customization_document.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace views {
 class Widget;
 }  // namespace views
 
 namespace chromeos {
 
 class AppLaunchController;
 class AutoEnrollmentController;
 class LoginScreenContext;
+class OobeUI;
 class WebUILoginView;
 class WizardController;
 
 // An interface that defines OOBE/login screen host.
 // Host encapsulates WebUI window OOBE/login controllers,
 // UI implementation (such as LoginDisplay).
 class LoginDisplayHost {
  public:
+  // Returns the default LoginDisplayHost instance if it has been created.
+  static LoginDisplayHost* default_host() { return default_host_; }
+
   virtual ~LoginDisplayHost() {}
 
   // Creates UI implementation specific login display instance (views/WebUI).
   // The caller takes ownership of the returned value.
   virtual LoginDisplay* CreateLoginDisplay(
       LoginDisplay::Delegate* delegate) = 0;
 
   // Returns corresponding native window.
   virtual gfx::NativeWindow GetNativeWindow() const = 0;
 
+  // Returns instance of the OOBE WebUI.
+  virtual OobeUI* GetOobeUI() const = 0;
+
   // Returns the current login view.
   virtual WebUILoginView* GetWebUILoginView() const = 0;
 
   // Called when browsing session starts before creating initial browser.
   virtual void BeforeSessionStart() = 0;
 
   // Called when user enters or returns to browsing session so
   // LoginDisplayHost instance may delete itself.
   virtual void Finalize() = 0;
 
@@ skipping 37 matching lines @@
   virtual void PrewarmAuthentication() = 0;
 
   // Starts app launch splash screen. If |is_auto_launch| is true, the app is
   // being auto-launched with no delay.
   virtual void StartAppLaunch(const std::string& app_id,
                               bool diagnostic_mode,
                               bool is_auto_launch) = 0;
 
   // Starts the demo app launch.
   virtual void StartDemoAppLaunch() = 0;
+
+ protected:
+  // Default LoginDisplayHost. Child class sets the reference.
+  static LoginDisplayHost* default_host_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_H_