Handle transient children as a part of transient parent

athena/wm/public/window_list_provider.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 ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_H_
 #define ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_H_
 
 #include "athena/athena_export.h"
 #include "ui/aura/window.h"
 
@@ skipping 11 matching lines @@
   // Adding/removing an observer to status changes.
   virtual void AddObserver(WindowListProviderObserver* observer) = 0;
   virtual void RemoveObserver(WindowListProviderObserver* observer) = 0;
 
   // Returns an ordered list of the current window configuration.
   virtual const aura::Window::Windows& GetWindowList() const = 0;
 
   // Returns true if the |window| is part of the list.
   virtual bool IsWindowInList(aura::Window* window) const = 0;
 
-  // Returns true if the given window is a window which can be handled by the
-  // WindowListProvider.
-  virtual bool IsValidWindow(aura::Window* window) const = 0;
-
   // Stacks a given |window| in direct front of a |reference_window|.
   // Note: The |window| and |reference_window| has to be in the list already.
   virtual void StackWindowFrontOf(aura::Window* window,
                                   aura::Window* reference_window) = 0;
 
   // Stacks a given |window| directly behind a |reference_window|.
   // Note: The |window| and |reference_window| has to be in the list already.
   virtual void StackWindowBehindTo(aura::Window* window,
                                    aura::Window* reference_window) = 0;
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_PUBLIC_WINDOW_LIST_PROVIDER_H_