[Win] App launcher drag/drop.

ui/app_list/apps_grid_view_delegate.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 UI_APP_LIST_APPS_GRID_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APPS_GRID_VIEW_DELEGATE_H_
 
+#include "base/callback_forward.h"
 #include "ui/app_list/app_list_export.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace app_list {
 
 class AppListItemModel;
 
 class APP_LIST_EXPORT AppsGridViewDelegate {
  public:
   // Invoked when an item is activated on the grid view. |event_flags| contains
   // the flags of the keyboard/mouse event that triggers the activation request.
   virtual void ActivateApp(AppListItemModel* item, int event_flags) = 0;
 
+  // Gets the path to a shortcut for the app represented by |item|. |callback|
+  // may be run immediately.
+  virtual void GetShortcutPathForApp(
+      const std::string& app_id,
+      const base::Callback<void(const base::FilePath&)>& callback) = 0;
+
  protected:
   virtual ~AppsGridViewDelegate() {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APPS_GRID_VIEW_DELEGATE_H_