Fill in some of ServiceWorkerFetchStores.

content/browser/service_worker/service_worker_fetch_store.cc

+// 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.
+
+#include "content/browser/service_worker/service_worker_fetch_store.h"
+
+#include <string>
+
+#include "base/files/file_path.h"
+
+namespace content {
+
+// static
+ServiceWorkerFetchStore* ServiceWorkerFetchStore::CreateMemoryStore(
+    const std::string& name) {
+  return new ServiceWorkerFetchStore(base::FilePath(), name);
+}
+
+// static
+ServiceWorkerFetchStore* ServiceWorkerFetchStore::CreatePersistentStore(
+    const base::FilePath& path,
+    const std::string& name) {
+  return new ServiceWorkerFetchStore(path, name);
+}
+
+void ServiceWorkerFetchStore::InitializeIfNeeded(
+    const base::Callback<void(bool)>& callback) {
+  callback.Run(true);
+}
+
+ServiceWorkerFetchStore::ServiceWorkerFetchStore(const base::FilePath& path,
+                                                 const std::string& name)
+    : path_(path), name_(name), id_(0) {
+}
+
+ServiceWorkerFetchStore::~ServiceWorkerFetchStore() {
+}
+
+}  // namespace content