Refine error code returned by ServiceWorkerVersion::StartWorker (e.g. PROCESS_NOT_FOUND etc)

content/common/service_worker/service_worker_status_code.h

 // Copyright 2014 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 CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_
 #define CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_
 
 #include "content/common/content_export.h"
 
 namespace content {
@@ skipping 14 matching lines @@
   SERVICE_WORKER_ERROR_START_WORKER_FAILED,
 
   // Could not find a renderer process to run a service worker.
   SERVICE_WORKER_ERROR_PROCESS_NOT_FOUND,
 
   // Install event handling failed.
   SERVICE_WORKER_ERROR_INSTALL_WORKER_FAILED,
 
   // Activate event handling failed.
   SERVICE_WORKER_ERROR_ACTIVATE_WORKER_FAILED,
+
+  // Sending an IPC to the worker failed (often due to child process is
+  // terminated).
+  SERVICE_WORKER_ERROR_IPC_FAILED,
 };
 
 CONTENT_EXPORT const char* ServiceWorkerStatusToString(
     ServiceWorkerStatusCode code);
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_