Draggable peeking/fullscreen launcher with transparent background.

ash/app_list/app_list_delegate_impl.h

-// Copyright 2017 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_APP_LIST_APP_LIST_DELEGATE_IMPL_H_
-#define ASH_APP_LIST_APP_LIST_DELEGATE_IMPL_H_
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "ui/app_list/presenter/app_list_delegate.h"
-
-namespace ash {
-
-class ASH_EXPORT AppListDelegateImpl : public app_list::AppListDelegate {
- public:
-  explicit AppListDelegateImpl();
-  ~AppListDelegateImpl() override;
-
- private:
-  // app_list::AppListDelegate:
-  void OnAppListVisibilityChanged(bool visible, int64_t display_id) override;
-
-  DISALLOW_COPY_AND_ASSIGN(AppListDelegateImpl);
-};
-
-}  // namespace ash
-
-#endif  // ASH_APP_LIST_APP_LIST_DELEGATE_IMPL_H_