ash: Start/stop observing KeyboardController via ShellObserver

ash/common/shelf/shelf_layout_manager.h

 // Copyright 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_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/session/session_state_observer.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/dock/docked_window_layout_manager_observer.h"
 #include "ash/common/wm/lock_state_observer.h"
 #include "ash/common/wm/wm_snap_to_pixel_layout_manager.h"
 #include "ash/common/wm/workspace/workspace_types.h"
 #include "ash/public/cpp/shelf_types.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
+#include "base/scoped_observer.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/wm/public/activation_change_observer.h"
 
+namespace keyboard {
+class KeyboardController;
+}
+
 namespace ui {
 class ImplicitAnimationObserver;
 class MouseEvent;
 }
 
 namespace ash {
 
 enum class AnimationChangeType;
 class PanelLayoutManagerTest;
 class ShelfLayoutManagerObserver;
@@ skipping 91 matching lines @@
   void SetAnimationDurationOverride(int duration_override_in_ms);
 
   // Overridden from wm::WmSnapToPixelLayoutManager:
   void OnWindowResized() override;
   void SetChildBounds(WmWindow* child,
                       const gfx::Rect& requested_bounds) override;
 
   // Overridden from ShellObserver:
   void OnShelfAutoHideBehaviorChanged(WmWindow* root_window) override;
   void OnPinnedStateChanged(WmWindow* pinned_window) override;
+  void OnVirtualKeyboardStateChanged(bool activated,
+                                     WmWindow* root_window) override;
 
   // Overridden from aura::client::ActivationChangeObserver:
   void OnWindowActivated(ActivationReason reason,
                          aura::Window* gained_active,
                          aura::Window* lost_active) override;
 
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
   void OnKeyboardClosed() override;
 
@@ skipping 203 matching lines @@
   // needs to be removed from the available work area.
   int chromevox_panel_height_;
 
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;
 
   // The current shelf background. Should not be assigned to directly, use
   // MaybeUpdateShelfBackground() instead.
   ShelfBackgroundType shelf_background_type_;
 
+  ScopedObserver<keyboard::KeyboardController,
+                 keyboard::KeyboardControllerObserver>
+      keyboard_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_LAYOUT_MANAGER_H_