Allow script to request durable storage permission (chrome side)

chrome/browser/storage/durable_storage_permission_context_factory.h

Index: chrome/browser/storage/durable_storage_permission_context_factory.h
diff --git a/chrome/browser/storage/durable_storage_permission_context_factory.h b/chrome/browser/storage/durable_storage_permission_context_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..598fd8722b4a2b5f0b3c04b185d3c038a07eb3ee
--- /dev/null
+++ b/chrome/browser/storage/durable_storage_permission_context_factory.h
@@ -0,0 +1,35 @@
+// Copyright 2015 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 CHROME_BROWSER_STORAGE_DURABLE_STORAGE_PERMISSION_CONTEXT_FACTORY_H_
+#define CHROME_BROWSER_STORAGE_DURABLE_STORAGE_PERMISSION_CONTEXT_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+class DurableStoragePermissionContext;
+class Profile;
+
+class DurableStoragePermissionContextFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static DurableStoragePermissionContext* GetForProfile(Profile* profile);
+  static DurableStoragePermissionContextFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<DurableStoragePermissionContextFactory>;
+
+  DurableStoragePermissionContextFactory();
+  ~DurableStoragePermissionContextFactory() override = default;
+
+  // BrowserContextKeyedBaseFactory methods:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(DurableStoragePermissionContextFactory);
+};
+
+#endif  // CHROME_BROWSER_STORAGE_DURABLE_STORAGE_PERMISSION_CONTEXT_FACTORY_H_