Implement NativeWidgetMac::ReorderNativeViews

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 6f5dec0f96864ede56c8a7cf940de5ebf964aa92..463901ddd8f9524c4d16cd7ef8969c199d41e135 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -884,6 +884,25 @@ void BridgedNativeWidget::CreateLayer(ui::LayerType layer_type,
   UpdateLayerProperties();
 }
 
+void BridgedNativeWidget::SetAssociationForView(const views::View* view,
+                                                NSView* native_view) {
+  DCHECK_EQ(0u, associated_views_.count(view));
+  [bridged_view_ addSubview:native_view];
+  associated_views_[view] = native_view;
+  native_widget_mac_->GetWidget()->ReorderNativeViews();
+}
+
+void BridgedNativeWidget::ClearAssociationForView(const views::View* view) {
+  auto it = associated_views_.find(view);
+  DCHECK(it != associated_views_.end());
+  [it->second removeFromSuperview];
+  associated_views_.erase(it);
+}
+
+void BridgedNativeWidget::ReorderChildViews() {
+  ReorderChildNSViews(native_widget_mac_->GetWidget(), associated_views_);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // BridgedNativeWidget, internal::InputMethodDelegate: