Add the beginning of a public Service Worker API.

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 {
-
-// Generic service worker operation statuses.
-enum ServiceWorkerStatusCode {
-  // Operation succeeded.
-  SERVICE_WORKER_OK,
-
-  // Generic operation error (more specific error code should be used in
-  // general).
-  SERVICE_WORKER_ERROR_FAILED,
-
-  // Operation was aborted (e.g. due to context or child process shutdown).
-  SERVICE_WORKER_ERROR_ABORT,
-
-  // Starting a new service worker script context failed.
-  SERVICE_WORKER_ERROR_START_WORKER_FAILED,
-
-  // Could not find a renderer process to run a service worker.
-  SERVICE_WORKER_ERROR_PROCESS_NOT_FOUND,
-
-  // Generic error code to indicate the specified item is not found.
-  SERVICE_WORKER_ERROR_NOT_FOUND,
-
-  // Generic error code to indicate the specified item already exists.
-  SERVICE_WORKER_ERROR_EXISTS,
-
-  // 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_