ash: Start/stop observing KeyboardController via ShellObserver

ash/common/wm/panels/panel_layout_manager.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 ASH_COMMON_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
 #define ASH_COMMON_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
 
 #include <list>
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/wm_shelf_observer.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/window_state_observer.h"
 #include "ash/common/wm_display_observer.h"
 #include "ash/common/wm_layout_manager.h"
 #include "ash/root_window_controller.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/scoped_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/keyboard/keyboard_controller.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/wm/public/activation_change_observer.h"
 
 namespace gfx {
 class Rect;
 }
 
@@ skipping 57 matching lines @@
   void OnWindowAddedToLayout(WmWindow* child) override;
   void OnWillRemoveWindowFromLayout(WmWindow* child) override;
   void OnWindowRemovedFromLayout(WmWindow* child) override;
   void OnChildWindowVisibilityChanged(WmWindow* child, bool visibile) override;
   void SetChildBounds(WmWindow* child,
                       const gfx::Rect& requested_bounds) override;
 
   // Overridden from ShellObserver:
   void OnOverviewModeEnded() override;
   void OnShelfAlignmentChanged(WmWindow* root_window) override;
+  void OnVirtualKeyboardStateChanged(bool activated) override;
 
   // Overridden from aura::WindowObserver
   void OnWindowPropertyChanged(aura::Window* window,
                                const void* key,
                                intptr_t old) override;
 
   // Overridden from wm::WindowStateObserver
   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
                                    wm::WindowStateType old_type) override;
 
@@ skipping 81 matching lines @@
   WmShelf* shelf_;
 
   // When not NULL, the shelf is hidden (i.e. full screen) and this tracks the
   // set of panel windows which have been temporarily hidden and need to be
   // restored when the shelf becomes visible again.
   std::unique_ptr<aura::WindowTracker> restore_windows_on_shelf_visible_;
 
   // The last active panel. Used to maintain stacking order even if no panels
   // are currently focused.
   WmWindow* last_active_panel_;
+
+  ScopedObserver<keyboard::KeyboardController,
+                 keyboard::KeyboardControllerObserver>
+      keyboard_observer_;
+
   base::WeakPtrFactory<PanelLayoutManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_PANELS_PANEL_LAYOUT_MANAGER_H_