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

ui/views/cocoa/views_nswindow_delegate.mm

 // 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.
 
 #import "ui/views/cocoa/views_nswindow_delegate.h"
 
 #include "base/logging.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ skipping 17 matching lines @@
 }
 
 - (void)setCursor:(NSCursor*)newCursor {
   if (cursor_.get() == newCursor)
     return;
 
   cursor_.reset([newCursor retain]);
   [parent_->ns_window() resetCursorRects];
 }
 
-- (void)onWindowOrderWillChange:(NSWindowOrderingMode)orderingMode {
-  parent_->OnVisibilityChangedTo(orderingMode != NSWindowOut);
-}
-
 - (void)onWindowOrderChanged:(NSNotification*)notification {
   parent_->OnVisibilityChanged();
 }
 
-- (void)onWindowWillDisplay {
-  parent_->OnVisibilityChangedTo(true);
-}
-
 - (void)sheetDidEnd:(NSWindow*)sheet
          returnCode:(NSInteger)returnCode
         contextInfo:(void*)contextInfo {
   [sheet orderOut:nil];
   parent_->OnWindowWillClose();
 }
 
 - (BOOL)shouldRepostPendingLeftMouseDown:(NSPoint)locationInWindow {
   return parent_->ShouldRepostPendingLeftMouseDown(locationInWindow);
 }
@@ skipping 76 matching lines @@
             usingRect:(NSRect)defaultSheetLocation {
   // As per NSWindowDelegate documentation, the origin indicates the top left
   // point of the host frame in window coordinates. The width changes the
   // animation from vertical to trapezoid if it is smaller than the width of the
   // dialog. The height is ignored but should be set to zero.
   return NSMakeRect(0, [self nativeWidgetMac]->SheetPositionY(),
                     NSWidth(defaultSheetLocation), 0);
 }
 
 @end