ServiceWorker: More accurate StartWorker result and UMA

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 45 matching lines @@
 
   // An error triggered by invalid worker state.
   SERVICE_WORKER_ERROR_STATE,
 
   // The Service Worker took too long to finish a task.
   SERVICE_WORKER_ERROR_TIMEOUT,
 
   // An error occurred during initial script evaluation.
   SERVICE_WORKER_ERROR_SCRIPT_EVALUATE_FAILED,
 
+  // Generic error to indicate failure to read/write the disk cache.
+  SERVICE_WORKER_ERROR_DISK_CACHE,
+
   SERVICE_WORKER_ERROR_MAX_VALUE
 };
 
 CONTENT_EXPORT const char* ServiceWorkerStatusToString(
     ServiceWorkerStatusCode code);
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_