A window should not get activated or get input focus if it's behind the lock screen.

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index 85ab0aee9c0de3c74cd08d52dc8b9764d3a1a745..18d27912dd410d47a4aff26ba2c7098e14ff8fdd 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -495,7 +495,8 @@ void NativeWidgetAura::ShowWithWindowState(ui::WindowShowState state) {
     // SetInitialFocus() should be always be called, even for
     // SHOW_STATE_INACTIVE. If the window has to stay inactive, the method will
     // do the right thing.
-    SetInitialFocus(state);
+    SetInitialFocus(wm::CanActivateWindow(window_) ? state
+                                                   : ui::SHOW_STATE_INACTIVE);
   }
 
   // On desktop aura, a window is activated first even when it is shown as