Adds AppListDelegate to AppList that is notified on visibility changes

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 <memory>
 #include <utility>
 #include <vector>
@@ skipping 54 matching lines @@
 class AcceleratorFilter;
 class CompoundEventFilter;
 class ShadowController;
 class VisibilityController;
 class WindowModalityController;
 }
 
 namespace ash {
 
 class AcceleratorControllerDelegateAura;
+class AppListDelegateImpl;
 class AshNativeCursorManager;
 class AutoclickController;
 class BluetoothNotificationController;
 class DisplayColorManager;
 class DisplayConfigurationController;
 class DisplayErrorObserver;
 class DragDropController;
 class EventClientImpl;
 class EventTransformationHandler;
 class FirstRunHelper;
@@ skipping 458 matching lines @@
   // For testing only: simulate that a modal window is open
   bool simulate_modal_window_open_for_testing_;
 
   bool is_touch_hud_projection_enabled_;
 
   // Injected content::GPUDataManager support.
   std::unique_ptr<GPUSupport> gpu_support_;
 
   std::unique_ptr<ImmersiveHandlerFactoryAsh> immersive_handler_factory_;
 
+  std::unique_ptr<AppListDelegateImpl> app_list_delegate_impl_;
+
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_