Add the ability to show a demo app on OOBE if a machine is derelict.

chrome/browser/chromeos/login/login_display_host.h

Index: chrome/browser/chromeos/login/login_display_host.h
diff --git a/chrome/browser/chromeos/login/login_display_host.h b/chrome/browser/chromeos/login/login_display_host.h
index 72f60d72d53fd6c3385ab91b7f9c2ce2eaa35435..4dc1adba2b34f83bbefbc942fa716eb45610096c 100644
--- a/chrome/browser/chromeos/login/login_display_host.h
+++ b/chrome/browser/chromeos/login/login_display_host.h
@@ -111,6 +111,9 @@ class LoginDisplayHost {
   // Starts app launch splash screen.
   virtual void StartAppLaunch(const std::string& app_id,
                               bool diagnostic_mode) = 0;
+
+  // Starts the demo app launch.
+  virtual void StartDemoAppLaunch() = 0;
 };
 
 }  // namespace chromeos