Support cancelling toast

ui/arc/notification/arc_notification_manager.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 "ui/arc/notification/arc_notification_manager.h"
 
 #include "ash/shell.h"
 #include "ash/system/toast/toast_manager.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
@@ skipping 161 matching lines @@
     default:
       VLOG(3) << "Invalid button index (key: " << key << ", index: " <<
           button_index << ").";
       return;
   }
 
   notifications_instance->SendNotificationEventToAndroid(key, command);
 }
 
 void ArcNotificationManager::OnToastPosted(mojom::ArcToastDataPtr data) {
-  ash::Shell::GetInstance()->toast_manager()->Show(data->text, data->duration);
+  ash::Shell::GetInstance()->toast_manager()->Show(
+      ash::ToastData(data->id, data->text, data->duration));
 }
 
 void ArcNotificationManager::OnToastCancelled(mojom::ArcToastDataPtr data) {
-  // TODO(yoshiki): Implement cancel.
+  ash::Shell::GetInstance()->toast_manager()->Cancel(data->id);
 }
 
 }  // namespace arc