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..8c16994af4eb41f083a4347f02b8ad1186011328 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -489,7 +489,7 @@ void NativeWidgetAura::ShowWithWindowState(ui::WindowShowState state) {
     window_->SetProperty(aura::client::kShowStateKey, state);
   }
   window_->Show();
-  if (delegate_->CanActivate()) {
+  if (delegate_->CanActivate() && wm::CanActivateWindow(window_)) {

[sky, 2016/03/03 20:22:47]

I think this is the wrong place for the fix. If you call Activate() and the
window isn't active, then the FocusController should ignore the activate
request.

[xdai1, 2016/03/03 22:01:31]

You're right. Since the goal is to prevent SetInitalFocus() from being called,
so maybe I should move this one line fix below?

[sky, 2016/03/03 23:39:33]

What is SetInitialFocus doing that is wrong? I think what should happen is if
Activate fails then you supply ui::SHOW_STATE_INACTIVE to SetInitialFocus. But I
could be misunderstanding the bug.

     if (state != ui::SHOW_STATE_INACTIVE)
       Activate();
     // SetInitialFocus() should be always be called, even for