add HideAndClose in preference to having Close sometimes magically defer

ui/views/widget/desktop_aura/desktop_root_window_host.h

 // Copyright (c) 2012 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_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_H_
 
 #include "ui/base/ui_base_types.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget.h"
@@ skipping 29 matching lines @@
 
   // Return the NativeTheme to use for |window|.
   static ui::NativeTheme* GetNativeTheme(aura::Window* window);
 
   // Creates the aura resources associated with the native window we built.
   // Caller takes ownership of returned RootWindow.
   virtual aura::RootWindow* Init(aura::Window* content_window,
                                  const Widget::InitParams& params) = 0;
   virtual void InitFocus(aura::Window* window) = 0;
 
+  virtual bool SetCloseOnHideCompletion() = 0;
   virtual void Close() = 0;
   virtual void CloseNow() = 0;
 
   virtual aura::RootWindowHost* AsRootWindowHost() = 0;
 
   virtual void ShowWindowWithState(ui::WindowShowState show_state) = 0;
   virtual void ShowMaximizedWithBounds(const gfx::Rect& restored_bounds) = 0;
 
   virtual bool IsVisible() const = 0;
 
@@ skipping 51 matching lines @@
 
   // Called when the DesktopNativeWidgetAura's aura::Window is focused and
   // blurred.
   virtual void OnNativeWidgetFocus() = 0;
   virtual void OnNativeWidgetBlur() = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_H_