ServiceWorker: Add UMA for ServiceWorkerDatabase

content/browser/service_worker/service_worker_storage.cc

 // Copyright 2013 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 "content/browser/service_worker/service_worker_storage.h"
 
 #include <string>
 
 #include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 46 matching lines @@
 
 void EmptyCompletionCallback(int) {}
 
 ServiceWorkerStatusCode DatabaseStatusToStatusCode(
     ServiceWorkerDatabase::Status status) {
   switch (status) {
     case ServiceWorkerDatabase::STATUS_OK:
       return SERVICE_WORKER_OK;
     case ServiceWorkerDatabase::STATUS_ERROR_NOT_FOUND:
       return SERVICE_WORKER_ERROR_NOT_FOUND;
+    case ServiceWorkerDatabase::STATUS_ERROR_MAX:
+      NOTREACHED();
     default:
       return SERVICE_WORKER_ERROR_FAILED;
   }
 }
 
 }  // namespace
 
 ServiceWorkerStorage::InitialData::InitialData()
     : next_registration_id(kInvalidServiceWorkerRegistrationId),
       next_version_id(kInvalidServiceWorkerVersionId),
@@ skipping 884 matching lines @@
     const FindInDBCallback& callback) {
   ServiceWorkerDatabase::RegistrationData data;
   ResourceList resources;
   ServiceWorkerDatabase::Status status =
       database->ReadRegistration(registration_id, origin, &data, &resources);
   original_task_runner->PostTask(
       FROM_HERE, base::Bind(callback, data, resources, status));
 }
 
 }  // namespace content