Handle app custom icon via aura::Window property.

chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.cc

 // 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.
 #include "chrome/browser/ui/ash/launcher/arc_app_window_launcher_controller.h"
 
 #include <string>
 
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/public/cpp/window_properties.h"
 #include "ash/shared/app_types.h"
@@ skipping 530 matching lines @@
   const arc::ArcAppShelfId& app_shelf_id = app_window_info.app_shelf_id();
   const auto it = app_shelf_group_to_controller_map_.find(app_shelf_id);
   if (it != app_shelf_group_to_controller_map_.end()) {
     DCHECK_EQ(it->second->app_id(), app_shelf_id.ToString());
     it->second->AddTaskId(task_id);
     return it->second;
   }
 
   std::unique_ptr<ArcAppWindowLauncherItemController> controller =
       base::MakeUnique<ArcAppWindowLauncherItemController>(
-          app_shelf_id.ToString(), owner());
+          app_shelf_id.ToString());
   ArcAppWindowLauncherItemController* item_controller = controller.get();
   const ash::ShelfID shelf_id(app_shelf_id.ToString());
   if (!owner()->GetItem(shelf_id)) {
     owner()->CreateAppLauncherItem(std::move(controller), ash::STATUS_RUNNING);
   } else {
     owner()->shelf_model()->SetShelfItemDelegate(shelf_id,
                                                  std::move(controller));
     owner()->SetItemStatus(shelf_id, ash::STATUS_RUNNING);
   }
   item_controller->AddTaskId(task_id);
@@ skipping 66 matching lines @@
   const std::string* arc_app_id = exo::ShellSurface::GetApplicationId(window);
   if (!arc_app_id)
     return -1;
 
   int task_id = -1;
   if (sscanf(arc_app_id->c_str(), "org.chromium.arc.%d", &task_id) != 1)
     return -1;
 
   return task_id;
 }