Refactor kiosk app launch to be part of login screen UI flow.

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index 7a2ff11666e38d5d24e74cddcff54bab1092964d..1b771bf09fb49756c721f27924eb0e60724c03a5 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -67,9 +67,6 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Tells the controller to resume a pending login.
   void ResumeLogin();
 
-  // Invoked to prepare for a kiosk app launch attempt.
-  void PrepareKioskAppLaunch();
-
   // Start the public session auto-login timer.
   void StartPublicSessionAutoLoginTimer();
 
@@ -98,6 +95,7 @@ class ExistingUserController : public LoginDisplay::Delegate,
   virtual void SetDisplayEmail(const std::string& email) OVERRIDE;
   virtual void ShowWrongHWIDScreen() OVERRIDE;
   virtual void Signout() OVERRIDE;
+  virtual void LaunchKioskApp(const std::string& app_id) OVERRIDE;

[xiyuan, 2013/08/15 18:19:42]

nit: LaunchKioskApp -> LoginAsKioskApp
Since we plan merge the login code path, it might make sense to have similar
names with the rest of the flows.

[Tim Song, 2013/08/16 19:07:59]

Done.

 
   // content::NotificationObserver implementation.
   virtual void Observe(int type,