Hide popup custom notifications on non-primary displays

ash/system/web_notification/ash_popup_alignment_delegate.cc

Index: ash/system/web_notification/ash_popup_alignment_delegate.cc
diff --git a/ash/system/web_notification/ash_popup_alignment_delegate.cc b/ash/system/web_notification/ash_popup_alignment_delegate.cc
index 360062a087854595b8a2c9ed12dca3fad9da3e9b..f2e4d84ddb6b7271b2ddce0a018b0597d37beb1e 100644
--- a/ash/system/web_notification/ash_popup_alignment_delegate.cc
+++ b/ash/system/web_notification/ash_popup_alignment_delegate.cc
@@ -122,6 +122,11 @@ void AshPopupAlignmentDelegate::ConfigureWidgetInitParamsForContainer(
           widget, kShellWindowId_StatusContainer, init_params);
 }
 
+bool AshPopupAlignmentDelegate::IsPrimaryDisplayForNotification() const {
+  return screen_ &&
+         GetCurrentDisplay().id() == screen_->GetPrimaryDisplay().id();
+}
+
 ShelfAlignment AshPopupAlignmentDelegate::GetAlignment() const {
   return shelf_->GetAlignment();
 }