Makes DefaultContainerLayoutManager ignore windows with transient

ui/aura/window.h

 // Copyright (c) 2011 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_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 #pragma once
 
 #include <map>
 #include <vector>
@@ skipping 164 matching lines @@
   // children get the following behavior:
   // . The transient parent destroys any transient children when it is
   //   destroyed. This means a transient child is destroyed if either its parent
   //   or transient parent is destroyed.
   // . If a transient child and its transient parent share the same parent, then
   //   transient children are always ordered above the trasient parent.
   // Transient windows are typically used for popups and menus.
   void AddTransientChild(Window* child);
   void RemoveTransientChild(Window* child);
 
+  const Windows& transient_children() const { return transient_children_; }
+
+  Window* transient_parent() { return transient_parent_; }
+  const Window* transient_parent() const { return transient_parent_; }
+
   // Retrieves the first-level child with the specified id, or NULL if no first-
   // level child is found matching |id|.
   Window* GetChildById(int id);
   const Window* GetChildById(int id) const;
 
   static void ConvertPointToWindow(const Window* source,
                                    const Window* target,
                                    gfx::Point* point);
 
   // Returns the cursor for the specified point, in window coordinates.
@@ skipping 160 matching lines @@
   // TODO(oshima): Consolidcate ViewProp and aura::window property
   // implementation.
   std::map<const char*, ui::ViewProp*> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_