Enable the PIN keyboard on the lockscreen.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index c76775d19845f945ed45c15ead45300df56a6f1a..f164b8c68b180384a41408366e7ccefbaa733f6c 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -45,6 +45,8 @@
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/lock/screen_locker.h"
 #include "chrome/browser/chromeos/login/profile_auth_data.h"
+#include "chrome/browser/chromeos/login/quick_unlock/pin_storage.h"
+#include "chrome/browser/chromeos/login/quick_unlock/pin_storage_factory.h"
 #include "chrome/browser/chromeos/login/saml/saml_offline_signin_limiter.h"
 #include "chrome/browser/chromeos/login/saml/saml_offline_signin_limiter_factory.h"
 #include "chrome/browser/chromeos/login/signin/oauth2_login_manager.h"
@@ -1275,6 +1277,12 @@ bool UserSessionManager::InitializeUserSession(Profile* profile) {
         (oobe_controller && oobe_controller->skip_post_login_screens()) ||
         cmdline->HasSwitch(chromeos::switches::kOobeSkipPostLogin);
 
+    // The user just signed into the profile session, so it means that they
+    // entered a password (or used easy unlock). We will enable quick unlock.
+    PinStorage* pin_storage = PinStorageFactory::GetForProfile(profile);
+    if (pin_storage)
+      pin_storage->MarkStrongAuth();
+
     if (user_manager->IsCurrentUserNew() && !skip_post_login_screens) {
       // Don't specify start URLs if the administrator has configured the start
       // URLs via policy.