Moves WindowCycleList/Controller to ash/common

ash/common/wm_shell.h

Index: ash/common/wm_shell.h
diff --git a/ash/common/wm_shell.h b/ash/common/wm_shell.h
index 2947fbfea2ae82e95db6f570ea3a6c3f72f42f2c..3ae326554ffedc20e7cbc51e393428051bd4781a 100644
--- a/ash/common/wm_shell.h
+++ b/ash/common/wm_shell.h
@@ -35,6 +35,7 @@ class ShellDelegate;
 class ShellObserver;
 class SystemTrayDelegate;
 class SystemTrayNotifier;
+class WindowCycleController;
 class WindowCycleEventFilter;
 class WindowResizer;
 class WindowSelectorController;
@@ -99,6 +100,10 @@ class ASH_EXPORT WmShell {
     return system_tray_delegate_.get();
   }
 
+  WindowCycleController* window_cycle_controller() {
+    return window_cycle_controller_.get();
+  }
+
   WindowSelectorController* window_selector_controller() {
     return window_selector_controller_.get();
   }
@@ -244,6 +249,8 @@ class ASH_EXPORT WmShell {
   void SetSystemTrayDelegate(std::unique_ptr<SystemTrayDelegate> delegate);
   void DeleteSystemTrayDelegate();
 
+  void DeleteWindowCycleController();
+
   void DeleteWindowSelectorController();
 
   void CreateMaximizeModeController();
@@ -272,6 +279,7 @@ class ASH_EXPORT WmShell {
   std::unique_ptr<MruWindowTracker> mru_window_tracker_;
   std::unique_ptr<SystemTrayNotifier> system_tray_notifier_;
   std::unique_ptr<SystemTrayDelegate> system_tray_delegate_;
+  std::unique_ptr<WindowCycleController> window_cycle_controller_;
   std::unique_ptr<WindowSelectorController> window_selector_controller_;
 
   bool simulate_modal_window_open_for_testing_ = false;