Re-reland: chromeos: Fix shelf appearing at login screen under mash

ash/aura/wm_shell_aura.cc

Index: ash/aura/wm_shell_aura.cc
diff --git a/ash/aura/wm_shell_aura.cc b/ash/aura/wm_shell_aura.cc
index 1d99a96a81f487c382500c5864e004655cae1da0..1d27a92fcd70393081701550212cfe248153b724 100644
--- a/ash/aura/wm_shell_aura.cc
+++ b/ash/aura/wm_shell_aura.cc
@@ -318,6 +318,15 @@ void WmShellAura::OnAttemptToReactivateWindow(aura::Window* request_active,
   }
 }
 
+void WmShellAura::SessionStateChanged(session_manager::SessionState state) {
+  // Create the shelf if necessary.
+  WmShell::SessionStateChanged(state);
+
+  // Recreate the keyboard after initial login and after multiprofile login.
+  if (state == session_manager::SessionState::ACTIVE)
+    Shell::GetInstance()->CreateKeyboard();
+}
+
 void WmShellAura::OnDisplayConfigurationChanging() {
   for (auto& observer : display_observers_)
     observer.OnDisplayConfigurationChanging();