Add app_list_presenterr pointer in app_list_presenter_delegate_mus to use dismiss function

chrome/browser/ui/ash/app_list/app_list_presenter_delegate_mus.h

 // Copyright 2016 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 CHROME_BROWSER_UI_ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_MUS_H_
 #define CHROME_BROWSER_UI_ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_MUS_H_
 
 #include "ui/app_list/presenter/app_list_presenter_delegate.h"
+#include "ui/app_list/presenter/app_list_presenter.h"
+#include "base/macros.h"
 
-#include "base/macros.h"
+#include "ui/views/pointer_watcher.h"
+#include "ash/common/wm_shell.h"
+#include "ui/views/mus/pointer_watcher_event_router.h"
 
 namespace app_list {
 class AppListView;
+class AppListPresenter;
 class AppListViewDelegateFactory;
 }
 
 // Mus+ash implementation of AppListPresetnerDelegate.
 // Responsible for laying out the app list UI as well as dismissing the app list
 // on in response to certain events (e.g. on mouse/touch gesture outside of the
 // app list bounds).
-class AppListPresenterDelegateMus : public app_list::AppListPresenterDelegate {
+class AppListPresenterDelegateMus : public app_list::AppListPresenterDelegate,
+                                    public views::PointerWatcher {
  public:
   explicit AppListPresenterDelegateMus(
+      app_list::AppListPresenter* presenter,
       app_list::AppListViewDelegateFactory* view_delegate_factory);
+
   ~AppListPresenterDelegateMus() override;
 
   // app_list::AppListPresenterDelegate:
   app_list::AppListViewDelegate* GetViewDelegate() override;
   void Init(app_list::AppListView* view,
             int64_t display_id,
             int current_apps_page) override;
   void OnShown(int64_t display_id) override;
   void OnDismissed() override;
   void UpdateBounds() override;
+
   gfx::Vector2d GetVisibilityAnimationOffset(
       aura::Window* root_window) override;
 
+  void OnPointerEventObserved(const ui::PointerEvent& event,
+                              const gfx::Point& location_in_screen,
+                              views::Widget* target) override;
+
  private:
   // Whether the app list is visible (or in the process of being shown).
   bool is_visible_ = false;
 
   // Not owned. Pointer is guaranteed to be valid while this object is alive.
   app_list::AppListViewDelegateFactory* view_delegate_factory_;
 
   // The current AppListView, owned by its widget.
   app_list::AppListView* view_ = nullptr;
+  app_list::AppListPresenter* presenter_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListPresenterDelegateMus);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_APP_LIST_APP_LIST_PRESENTER_DELEGATE_MUS_H_