ServiceWorker: Introduce ServiceWorkerDiskCacheMigrator

content/browser/service_worker/service_worker_disk_cache.cc

Index: content/browser/service_worker/service_worker_disk_cache.cc
diff --git a/content/browser/service_worker/service_worker_disk_cache.cc b/content/browser/service_worker/service_worker_disk_cache.cc
index 4b6237ff2346a926a380768351d7bd00fb64758a..0fa1927c073661acd4edb94e26cd70297b914818 100644
--- a/content/browser/service_worker/service_worker_disk_cache.cc
+++ b/content/browser/service_worker/service_worker_disk_cache.cc
@@ -6,6 +6,22 @@
 
 namespace content {
 
+scoped_ptr<ServiceWorkerDiskCache>
+ServiceWorkerDiskCache::CreateWithBlockFileBackend() {
+  return make_scoped_ptr(
+      new ServiceWorkerDiskCache(false /* use_simple_cache*/));
+}
+
+scoped_ptr<ServiceWorkerDiskCache>
+ServiceWorkerDiskCache::CreateWithSimpleBackend() {
+  return make_scoped_ptr(
+      new ServiceWorkerDiskCache(true /* use_simple_cache */));
+}
+
+ServiceWorkerDiskCache::ServiceWorkerDiskCache(bool use_simple_cache)
+    : AppCacheDiskCache(use_simple_cache) {
+}
+
 ServiceWorkerResponseReader::ServiceWorkerResponseReader(
     int64 response_id, ServiceWorkerDiskCache* disk_cache)
     : AppCacheResponseReader(response_id, 0, disk_cache) {