Call OnNativeWindowChanged after maximizing and restoring.

ui/views/widget/native_widget_delegate.h

Index: ui/views/widget/native_widget_delegate.h
diff --git a/ui/views/widget/native_widget_delegate.h b/ui/views/widget/native_widget_delegate.h
index c18b5fc80158f5704f3d5d080c7782513f699ac4..5088b45bfef35a1ce732b9185620daf5dc853c5a 100644
--- a/ui/views/widget/native_widget_delegate.h
+++ b/ui/views/widget/native_widget_delegate.h
@@ -91,6 +91,10 @@ class VIEWS_EXPORT NativeWidgetDelegate {
   // Called when the NativeWidget changed size to |new_size|.
   virtual void OnNativeWidgetSizeChanged(const gfx::Size& new_size) = 0;
 
+  // Called when the NativeWidget changed its window state.
+  virtual void OnNativeWidgetWindowShowStateChanged(
+      ui::WindowShowState old) = 0;
+
   // Called when the user begins/ends to change the bounds of the window.
   virtual void OnNativeWidgetBeginUserBoundsChange() = 0;
   virtual void OnNativeWidgetEndUserBoundsChange() = 0;