Fix cannot select and activate pinned v2app through launcher context menu

chrome/browser/ui/ash/launcher/launcher_item_controller.h

Index: chrome/browser/ui/ash/launcher/launcher_item_controller.h
diff --git a/chrome/browser/ui/ash/launcher/launcher_item_controller.h b/chrome/browser/ui/ash/launcher/launcher_item_controller.h
index 52c3c280f9e53e6db5e1e997168afa8c30eebcb3..0ba5e8a4e6c9e11b3111912ca6316ac2bad3c10a 100644
--- a/chrome/browser/ui/ash/launcher/launcher_item_controller.h
+++ b/chrome/browser/ui/ash/launcher/launcher_item_controller.h
@@ -14,6 +14,7 @@
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_types.h"
 #include "ui/events/event.h"
 
+class AppWindowLauncherItemController;
 class ChromeLauncherController;
 class ChromeLauncherAppMenuItem;
 
@@ -64,6 +65,9 @@ class LauncherItemController : public ash::ShelfItemDelegate {
   // Called to retrieve the list of running applications.
   virtual ChromeLauncherAppMenuItems GetApplicationList(int event_flags) = 0;
 
+  // Returns nullptr if class is not AppWindowLauncherItemController.
+  virtual AppWindowLauncherItemController* AsAppWindowLauncherItemController();
+
  private:
   // The application id; empty if there is no app associated with the item.
   const std::string app_id_;