ServiceWorker: Convert ServiceWorkerDatabase::Status to string for logging

content/browser/service_worker/service_worker_database.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_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 30 matching lines @@
 
   // Used in UMA. A new value must be appended only.
   enum Status {
     STATUS_OK,
     STATUS_ERROR_NOT_FOUND,
     STATUS_ERROR_IO_ERROR,
     STATUS_ERROR_CORRUPTED,
     STATUS_ERROR_FAILED,
     STATUS_ERROR_MAX,
   };
+  static const char* StatusToString(Status status);
 
   struct CONTENT_EXPORT RegistrationData {
     // These values are immutable for the life of a registration.
     int64 registration_id;
     GURL scope;
 
     // Versions are first stored once they successfully install and become
     // the waiting version. Then transition to the active version. The stored
     // version may be in the ACTIVATED state or in the INSTALLED state.
     GURL script;
@@ skipping 263 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DatabaseVersion);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, GetNextAvailableIds);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerDatabaseTest, DestroyDatabase);
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_DATABASE_H_