Move default_host from LoginDisplayHostImpl to LoginDisplayHost.

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

Index: chrome/browser/chromeos/login/ui/login_display_host.h
diff --git a/chrome/browser/chromeos/login/ui/login_display_host.h b/chrome/browser/chromeos/login/ui/login_display_host.h
index d0f06bf6c747a0e194de9ceeef05ff8aff776ace..6c704fceb15f914a3f534d1b9085bc4fb00b49f6 100644
--- a/chrome/browser/chromeos/login/ui/login_display_host.h
+++ b/chrome/browser/chromeos/login/ui/login_display_host.h
@@ -22,6 +22,7 @@ namespace chromeos {
 class AppLaunchController;
 class AutoEnrollmentController;
 class LoginScreenContext;
+class OobeUI;
 class WebUILoginView;
 class WizardController;
 
@@ -30,6 +31,9 @@ class WizardController;
 // 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).
@@ -40,6 +44,9 @@ class LoginDisplayHost {
   // 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;
 
@@ -97,6 +104,10 @@ class LoginDisplayHost {
 
   // Starts the demo app launch.
   virtual void StartDemoAppLaunch() = 0;
+
+ protected:
+  // Default LoginDisplayHost. Child class sets the reference.
+  static LoginDisplayHost* default_host_;
 };
 
 }  // namespace chromeos