MacViews: Attach child windows when parent is on the screen.

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>
 
 #import "base/mac/scoped_nsobject.h"
@@ skipping 17 matching lines @@
 // NULL if not created by NativeWidgetMac.
 @property(nonatomic, readonly) views::NativeWidgetMac* nativeWidgetMac;
 
 // If set, the cursor set in -[NSResponder updateCursor:] when the window is
 // reached along the responder chain.
 @property(retain, nonatomic) NSCursor* cursor;
 
 // 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). |notification| is optional and can be set when redirecting
 // a notification such as NSApplicationDidHideNotification.
 - (void)onWindowOrderChanged:(NSNotification*)notification;
 
 // Notify when -[NSWindow display] is being called on the window.
 - (void)onWindowWillDisplay;
 
@@ skipping 10 matching lines @@
 // Called when the application receives a mouse-down, but before the event
 // is processed by NSWindows. Returns NO if the event should be processed as-is,
 // or YES if the event should be reposted to handle window dragging. Events are
 // reposted at the CGSessionEventTap level because window dragging happens there
 // before the application receives the event.
 - (BOOL)shouldRepostPendingLeftMouseDown:(NSPoint)locationInWindow;
 
 @end
 
 #endif  // UI_VIEWS_COCOA_VIEWS_NSWINDOW_DELEGATE_H_