Refactor most recently used window tracking into a separate class.

ash/shell.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_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 62 matching lines @@
 class AcceleratorController;
 class AshNativeCursorManager;
 class CapsLockDelegate;
 class DesktopBackgroundController;
 class DisplayController;
 class HighContrastController;
 class Launcher;
 class LauncherDelegate;
 class LauncherModel;
 class MagnificationController;
+class MruWindowTracker;
 class NestedDispatcherController;
 class PartialMagnificationController;
 class PowerButtonController;
 class RootWindowHostFactory;
 class ScreenAsh;
 class LockStateController;
 class SessionStateDelegate;
 class ShellDelegate;
 class ShellObserver;
 class SystemTray;
@@ skipping 210 matching lines @@
   }
   DesktopBackgroundController* desktop_background_controller() {
     return desktop_background_controller_.get();
   }
   PowerButtonController* power_button_controller() {
     return power_button_controller_.get();
   }
   LockStateController* lock_state_controller() {
     return lock_state_controller_.get();
   }
+  MruWindowTracker* mru_window_tracker() {
+    return mru_window_tracker_.get();
+  }
   UserActivityDetector* user_activity_detector() {
     return user_activity_detector_.get();
   }
   VideoDetector* video_detector() {
     return video_detector_.get();
   }
   WindowCycleController* window_cycle_controller() {
     return window_cycle_controller_.get();
   }
   internal::FocusCycler* focus_cycler() {
@@ skipping 214 matching lines @@
   scoped_ptr<internal::DragDropController> drag_drop_controller_;
   scoped_ptr<internal::ResizeShadowController> resize_shadow_controller_;
   scoped_ptr<views::corewm::ShadowController> shadow_controller_;
   scoped_ptr<views::corewm::VisibilityController> visibility_controller_;
   scoped_ptr<views::corewm::WindowModalityController>
       window_modality_controller_;
   scoped_ptr<views::corewm::TooltipController> tooltip_controller_;
   scoped_ptr<DesktopBackgroundController> desktop_background_controller_;
   scoped_ptr<PowerButtonController> power_button_controller_;
   scoped_ptr<LockStateController> lock_state_controller_;
+  scoped_ptr<MruWindowTracker> mru_window_tracker_;
   scoped_ptr<UserActivityDetector> user_activity_detector_;
   scoped_ptr<VideoDetector> video_detector_;
   scoped_ptr<WindowCycleController> window_cycle_controller_;
   scoped_ptr<internal::FocusCycler> focus_cycler_;
   scoped_ptr<DisplayController> display_controller_;
   scoped_ptr<HighContrastController> high_contrast_controller_;
   scoped_ptr<MagnificationController> magnification_controller_;
   scoped_ptr<PartialMagnificationController> partial_magnification_controller_;
   scoped_ptr<aura::client::FocusClient> focus_client_;
   scoped_ptr<aura::client::UserActionClient> user_action_client_;
@@ skipping 51 matching lines @@
   bool simulate_modal_window_open_for_testing_;
 
   bool is_touch_hud_projection_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_