Allow script to request durable storage permission (chrome side)

chrome/browser/extensions/extension_special_storage_policy.h

 // Copyright (c) 2012 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_EXTENSIONS_EXTENSION_SPECIAL_STORAGE_POLICY_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SPECIAL_STORAGE_POLICY_H_
 
 #include <map>
 #include <string>
 
@@ skipping 23 matching lines @@
       content_settings::CookieSettings* cookie_settings);
 
   // storage::SpecialStoragePolicy methods used by storage subsystems and the
   // browsing data remover. These methods are safe to call on any thread.
   bool IsStorageProtected(const GURL& origin) override;
   bool IsStorageUnlimited(const GURL& origin) override;
   bool IsStorageSessionOnly(const GURL& origin) override;
   bool CanQueryDiskSize(const GURL& origin) override;
   bool HasIsolatedStorage(const GURL& origin) override;
   bool HasSessionOnlyOrigins() override;
+  bool IsStorageDurable(const GURL& origin) override;
 
   // Methods used by the ExtensionService to populate this class.
   void GrantRightsForExtension(const extensions::Extension* extension,
                                content::BrowserContext* browser_context);
   void RevokeRightsForExtension(const extensions::Extension* extension);
   void RevokeRightsForAllExtensions();
 
   // Decides whether the storage for |extension|'s web extent needs protection.
   bool NeedsProtection(const extensions::Extension* extension);
 
@@ skipping 36 matching lines @@
   SpecialCollection protected_apps_;
   SpecialCollection installed_apps_;
   SpecialCollection unlimited_extensions_;
   SpecialCollection file_handler_extensions_;
   SpecialCollection isolated_extensions_;
   SpecialCollection content_capabilities_unlimited_extensions_;
   scoped_refptr<content_settings::CookieSettings> cookie_settings_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SPECIAL_STORAGE_POLICY_H_