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.
+  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_;