Reorder the NativeViews attached to a view via kViewHostKey according to the position of the view

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 37a6e41face01420eb0b9c3e499b5e22b8b83a33..413e1ce9bae60fd9cace56f8079aac4bf5184193 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -39,6 +39,7 @@
 #include "ui/views/widget/tooltip_manager_aura.h"
 #include "ui/views/widget/widget_aura_utils.h"
 #include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/window_reorderer.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_gdi_object.h"
@@ -172,6 +173,9 @@ void NativeWidgetAura::InitNativeWidget(const Widget::InitParams& params) {
                        GetWidget()->widget_delegate()->CanMaximize());
   window_->SetProperty(aura::client::kCanResizeKey,
                        GetWidget()->widget_delegate()->CanResize());
+
+  window_reorderer_.reset(new WindowReorderer(window_,
+      GetWidget()->GetRootView()));
 }
 
 NonClientFrameView* NativeWidgetAura::CreateNonClientFrameView() {
@@ -223,6 +227,10 @@ ui::Layer* NativeWidgetAura::GetLayer() {
   return window_->layer();
 }
 
+void NativeWidgetAura::ReorderNativeViews() {
+  window_reorderer_->ReorderChildWindows();
+}
+
 void NativeWidgetAura::ViewRemoved(View* view) {
   DCHECK(drop_helper_.get() != NULL);
   drop_helper_->ResetTargetViewIfEquals(view);