Allow script to request durable storage permission (chrome side)

chrome/browser/durable_storage_permission_context.h

Index: chrome/browser/durable_storage_permission_context.h
diff --git a/chrome/browser/durable_storage_permission_context.h b/chrome/browser/durable_storage_permission_context.h
new file mode 100644
index 0000000000000000000000000000000000000000..aeb1cd9a86a5e8f0b439af9b91e8286c6aab2153
--- /dev/null
+++ b/chrome/browser/durable_storage_permission_context.h
@@ -0,0 +1,21 @@
+// 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_DURABLE_STORAGE_PERMISSION_CONTEXT_H_
+#define CHROME_BROWSER_DURABLE_STORAGE_PERMISSION_CONTEXT_H_
+
+#include "chrome/browser/permissions/permission_context_base.h"
+
+class DurableStoragePermissionContext : public PermissionContextBase {
+ public:
+  explicit DurableStoragePermissionContext(Profile* profile);
+  ~DurableStoragePermissionContext() override = default;
+
+  bool IsRestrictedToSecureOrigins() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DurableStoragePermissionContext);
+};
+
+#endif  // CHROME_BROWSER_DURABLE_STORAGE_PERMISSION_CONTEXT_H_