Implement a policy to autologin a public account.

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 73e5f0db2d94cfb3e2dbc6a4f784aa0c62732848..dd82d473964a8127f09f0b9112adf3e8ffe3ec2e 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -63,6 +63,12 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Tells the controller to resume a pending login.
   void ResumeLogin();
 
+  // Start the public account auto-login timer.

[bartfab (slow), 2013/02/11 09:46:01]

Nit: s/public account/public session/ (here and elsewhere)

[Nikita (slow), 2013/02/11 09:56:58]

nit: General comment about naming of these two methods.

If you want to be specific that this time is only used for public sessions (at
least for now) maybe it makes sense to rename these methods? 

[dconnelly, 2013/02/11 16:17:56]

Done.

[dconnelly, 2013/02/11 16:17:56]

Done.

+  void StartAutoLoginTimer();
+
+  // Stop the public account auto-login timer when a login attempt begins.
+  void StopAutoLoginTimer();
+
   // LoginDisplay::Delegate: implementation
   virtual void CancelPasswordChangedFlow() OVERRIDE;
   virtual void CreateAccount() OVERRIDE;
@@ -77,6 +83,7 @@ class ExistingUserController : public LoginDisplay::Delegate,
   virtual void LoginAsRetailModeUser() OVERRIDE;
   virtual void LoginAsGuest() OVERRIDE;
   virtual void LoginAsPublicAccount(const std::string& username) OVERRIDE;
+  virtual void OnSigninScreenReady() OVERRIDE;
   virtual void OnUserSelected(const std::string& username) OVERRIDE;
   virtual void OnStartEnterpriseEnrollment() OVERRIDE;
   virtual void OnStartDeviceReset() OVERRIDE;
@@ -194,6 +201,9 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // Updates the |login_display_| attached to this controller.
   void UpdateLoginDisplay(const UserList& users);
 
+  // Public account auto-login timer.
+  base::OneShotTimer<ExistingUserController> auto_login_timer_;
+
   // Used to execute login operations.
   scoped_ptr<LoginPerformer> login_performer_;
 
@@ -257,6 +267,9 @@ class ExistingUserController : public LoginDisplay::Delegate,
   // session.
   bool do_auto_enrollment_;
 
+  // Whether the sign-in UI is finished loading.
+  bool signin_screen_ready_;
+
   // The username used for auto-enrollment, if it was triggered.
   std::string auto_enrollment_username_;