Implement a policy to autologin a public account.

chrome/browser/chromeos/login/login_display.h

Index: chrome/browser/chromeos/login/login_display.h
diff --git a/chrome/browser/chromeos/login/login_display.h b/chrome/browser/chromeos/login/login_display.h
index 97182f5aed6e9d9bc752795846221e8484811b2c..f37293587c691e4055984c389a2dcad287f98431 100644
--- a/chrome/browser/chromeos/login/login_display.h
+++ b/chrome/browser/chromeos/login/login_display.h
@@ -67,6 +67,9 @@ class LoginDisplay : public RemoveUserDelegate {
     // Sign in into the public account identified by |username|.
     virtual void LoginAsPublicAccount(const std::string& username) = 0;
 
+    // Notify the delegate when the sign-in UI is finished loading.
+    virtual void OnSigninScreenReady() = 0;
+
     // Called when existing user pod is selected in the UI.
     virtual void OnUserSelected(const std::string& username) = 0;
 
@@ -79,6 +82,9 @@ class LoginDisplay : public RemoveUserDelegate {
     // Shows wrong HWID screen.
     virtual void ShowWrongHWIDScreen() = 0;
 
+    // Restarts the public-session auto-login timer if it is running.
+    virtual void ResetPublicSessionAutoLoginTimer() = 0;
+
     // Ignore password change, remove existing cryptohome and
     // force full sync of user data.
     virtual void ResyncUserData() = 0;