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

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 26828e00f96793cc1cb32b9069fafad76352648e..c4634c3063b248440a06d36da56a0bfcc5b8227f 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -41,6 +41,7 @@
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_aura_utils.h"
 #include "ui/views/widget/widget_delegate.h"
+#include "ui/views/widget/window_reorderer.h"
 
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(VIEWS_EXPORT,
                                       views::DesktopNativeWidgetAura*);
@@ -274,6 +275,9 @@ void DesktopNativeWidgetAura::InitNativeWidget(
   shadow_controller_.reset(
       new corewm::ShadowController(
           aura::client::GetActivationClient(root_window_.get())));
+
+  window_reorderer_.reset(new WindowReorderer(window_,
+      GetWidget()->GetRootView()));
 }
 
 NonClientFrameView* DesktopNativeWidgetAura::CreateNonClientFrameView() {
@@ -320,6 +324,10 @@ ui::Layer* DesktopNativeWidgetAura::GetLayer() {
   return window_->layer();
 }
 
+void DesktopNativeWidgetAura::ReorderNativeViews() {
+  window_reorderer_->ReorderChildWindows();
+}
+
 void DesktopNativeWidgetAura::ViewRemoved(View* view) {
 }