MacViews: Fix WidgetTest.DesktopNativeWidgetNoPaintAfterCloseTest

ui/views/cocoa/views_nswindow_delegate.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_COCOA_VIEWS_NSWINDOW_DELEGATE_H_
 #define UI_VIEWS_COCOA_VIEWS_NSWINDOW_DELEGATE_H_
 
 #import <Cocoa/Cocoa.h>
 
 namespace views {
 class NativeWidgetMac;
 class BridgedNativeWidget;
 }
 
 // The delegate set on the NSWindow when a views::BridgedNativeWidget is
 // initialized.
 @interface ViewsNSWindowDelegate : NSObject<NSWindowDelegate> {
  @private
   views::BridgedNativeWidget* parent_;  // Weak. Owns this.
 }
 
 // The NativeWidgetMac that created the window this is attached to. Returns
 // NULL if not created by NativeWidgetMac.
 @property(nonatomic, readonly) views::NativeWidgetMac* nativeWidgetMac;
 
 // 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_