Do not give instant focus if a view's toplevelwidget is not active

ui/views/mus/native_widget_mus.cc

Index: ui/views/mus/native_widget_mus.cc
diff --git a/ui/views/mus/native_widget_mus.cc b/ui/views/mus/native_widget_mus.cc
index 84fd935db5feb4c255c76eef18383aee1766eb7a..2d4da35990791b21ccd898d432ddedd33864924f 100644
--- a/ui/views/mus/native_widget_mus.cc
+++ b/ui/views/mus/native_widget_mus.cc
@@ -1113,11 +1113,11 @@ bool NativeWidgetMus::IsVisible() const {
 }
 
 void NativeWidgetMus::Activate() {
+  if (!window_)
+    return;
+
   static_cast<aura::client::ActivationClient*>(focus_client_.get())
       ->ActivateWindow(content_);
-  // FocusControllerMus should have focused |window_| when |content_| is
-  // activated.
-  DCHECK(!window_ || window_->HasFocus());
 }
 
 void NativeWidgetMus::Deactivate() {