Call OnNativeWindowChanged after maximizing and restoring.

ui/aura/window_delegate.h

Index: ui/aura/window_delegate.h
diff --git a/ui/aura/window_delegate.h b/ui/aura/window_delegate.h
index 90e978a39c2e103900cb07dc9c04d2a536fec7da..eab18c3b719b6b4d2e92451fda1a19f8cde464d6 100644
--- a/ui/aura/window_delegate.h
+++ b/ui/aura/window_delegate.h
@@ -44,6 +44,9 @@ class AURA_EXPORT WindowDelegate : public ui::EventHandler {
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) = 0;
 
+  // Called when a property of the window changes.
+  virtual void OnPropertyChanged(const void* key, intptr_t old) = 0;
+
   // Returns the native cursor for the specified point, in window coordinates,
   // or NULL for the default cursor.
   virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;