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 79 matching lines @@
                          aura::Window* gained_active,
                          aura::Window* lost_active) override;
 
   // Overridden from WindowTreeHostManager::Observer
   void OnDisplayConfigurationChanged() override;
 
   // Overridden from WmShelfObserver
   void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
   void OnShelfIconPositionsChanged() override;
 
+  void StartObservingKeyboard(
+      keyboard::KeyboardController* keyboard_controller);
+  void StopObservingKeyboard(keyboard::KeyboardController* keyboard_controller);
+
  private:
   friend class PanelLayoutManagerTest;
   friend class PanelWindowResizerTest;
   friend class DockedWindowResizerTest;
   friend class DockedWindowLayoutManagerTest;
   friend class WorkspaceControllerTest;
   friend class AcceleratorControllerTest;
 
   views::Widget* CreateCalloutWidget();
 
@@ skipping 59 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_