MacViews: Fix WidgetTest.DesktopNativeWidgetNoPaintAfterCloseTest

ui/views/cocoa/views_nswindow_delegate.h

Index: ui/views/cocoa/views_nswindow_delegate.h
diff --git a/ui/views/cocoa/views_nswindow_delegate.h b/ui/views/cocoa/views_nswindow_delegate.h
index 799cb80b19b35e3319ed1811e9d6246b962f39e5..2f1104c1bc3e7f7a2baf4a35e9d63280e8e59ee8 100644
--- a/ui/views/cocoa/views_nswindow_delegate.h
+++ b/ui/views/cocoa/views_nswindow_delegate.h
@@ -26,6 +26,16 @@ class BridgedNativeWidget;
 // Initialize with the given |parent|.
 - (id)initWithBridgedNativeWidget:(views::BridgedNativeWidget*)parent;
 
+// Notify that the window is about to be reordered on screen. This ensures a
+// paint will occur, even if Cocoa has not yet updated the window visibility.
+- (void)onWindowOrderWillChange:(NSWindowOrderingMode)orderingMode;
+
+// Notify that the window has been reordered in (or removed from) the window
+// server's screen list. This is a substitute for -[NSWindowDelegate
+// windowDidExpose:], which is only sent for nonretained windows (those without
+// a backing store).
+- (void)onWindowOrderChanged;
+
 @end
 
 #endif  // UI_VIEWS_COCOA_VIEWS_NSWINDOW_DELEGATE_H_