Only show virtual keyboard on primary root window

ui/keyboard/keyboard_controller.h

 // Copyright (c) 2013 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_KEYBOARD_KEYBOARD_CONTROLLER_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
@@ skipping 20 matching lines @@
 
 // Provides control of the virtual keyboard, including providing a container
 // and controlling visibility.
 class KEYBOARD_EXPORT KeyboardController : public ui::InputMethodObserver,
                                            public aura::WindowObserver {
  public:
   // Takes ownership of |proxy|.
   explicit KeyboardController(KeyboardControllerProxy* proxy);
   virtual ~KeyboardController();
 
-  // Returns the container for the keyboard, which is then owned by the caller.
-  // It is the responsibility of the caller to Show() the returned window.
+  // Returns the container for the keyboard, which is owned by
+  // KeyboardController.
   aura::Window* GetContainerWindow();
 
   // Hides virtual keyboard and notifies observer bounds change.
   // This function should be called with a delay to avoid layout flicker
   // when the focus of input field quickly change.
   void HideKeyboard();
 
   // Management of the observer list.
   virtual void AddObserver(KeyboardControllerObserver* observer);
   virtual void RemoveObserver(KeyboardControllerObserver* observer);
 
  private:
   // For access to Observer methods for simulation.
   friend class KeyboardControllerTest;
 
   // aura::WindowObserver overrides
   virtual void OnWindowHierarchyChanged(
       const HierarchyChangeParams& params) OVERRIDE;
-  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // InputMethodObserver overrides
   virtual void OnTextInputStateChanged(
       const ui::TextInputClient* client) OVERRIDE;
   virtual void OnInputMethodDestroyed(
       const ui::InputMethod* input_method) OVERRIDE;
 
   // Returns true if keyboard is scheduled to hide.
   bool WillHideKeyboard() const;
 
   scoped_ptr<KeyboardControllerProxy> proxy_;
-  aura::Window* container_;
+  scoped_ptr<aura::Window> container_;
   ui::InputMethod* input_method_;
   bool keyboard_visible_;
   base::WeakPtrFactory<KeyboardController> weak_factory_;
 
   ObserverList<KeyboardControllerObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_H_