Enable the PIN keyboard on the lockscreen.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index ead94f5b7c13d4fb68d76cfe4eb84ea9b0ab3cff..4f843b0874b79d1da6a1a400c26a26a754817de1 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -24,6 +24,7 @@
 #include "chrome/browser/ui/webui/chromeos/login/network_state_informer.h"
 #include "chrome/browser/ui/webui/chromeos/login/oobe_ui.h"
 #include "chrome/browser/ui/webui/chromeos/touch_view_controller_delegate.h"
+#include "chromeos/dbus/power_manager_client.h"
 #include "chromeos/network/portal_detector/network_portal_detector.h"
 #include "components/proximity_auth/screenlock_bridge.h"
 #include "components/user_manager/user_manager.h"
@@ -204,6 +205,7 @@ class SigninScreenHandler
       public LoginDisplayWebUIHandler,
       public content::NotificationObserver,
       public NetworkStateInformer::NetworkStateInformerObserver,
+      public PowerManagerClient::Observer,
       public input_method::ImeKeyboard::Observer,
       public TouchViewControllerDelegate::Observer,
       public OobeUI::Observer {
@@ -312,6 +314,9 @@ class SigninScreenHandler
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // PowerManagerClient::Observer implementation:
+  void SuspendDone(const base::TimeDelta& sleep_duration) override;
+
   // TouchViewControllerDelegate::Observer implementation:
   void OnMaximizeModeStarted() override;
   void OnMaximizeModeEnded() override;
@@ -321,12 +326,13 @@ class SigninScreenHandler
   // Restore input focus to current user pod.
   void RefocusCurrentPod();
 
+  // Hides the PIN keyboard if it is no longer available.
+  void HidePinKeyboardIfNeeded(const AccountId& account_id);
+
   // WebUI message handlers.
   void HandleGetUsers();
   void HandleAuthenticateUser(const AccountId& account_id,
                               const std::string& password);
-  void HandleAuthenticateUserWithPin(const AccountId& account_id,
-                                     const std::string& password);
   void HandleAttemptUnlock(const std::string& username);
   void HandleLaunchIncognito();
   void HandleLaunchPublicSession(const AccountId& account_id,