Allow script to request durable storage permission (chrome side)

components/content_settings/core/browser/cookie_settings.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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_COOKIE_SETTINGS_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_COOKIE_SETTINGS_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 72 matching lines @@
   void SetCookieSetting(const ContentSettingsPattern& primary_pattern,
                         const ContentSettingsPattern& secondary_pattern,
                         ContentSetting setting);
 
   // Resets the cookie setting for the given patterns.
   //
   // This should only be called on the UI thread.
   void ResetCookieSetting(const ContentSettingsPattern& primary_pattern,
                           const ContentSettingsPattern& secondary_pattern);
 
+  void GetDurableSettings(ContentSettingsForOneType* settings) const;

[mlamouri (slow - plz ping), 2015/07/02 09:53:01]

Why do we need that?

[dgrogan, 2015/07/07 04:15:11]

It's called by chrome/browser/extensions/extension_special_storage_policy.cc,
which is consulted by the quota logic to see if an origin should be exempt from
eviction.

Is there a better way?

+
   // Detaches the |CookieSettings| from |PrefService|. This methods needs to be
   // called before destroying the service. Afterwards, only const methods can be
   // called.
   void ShutdownOnUIThread() override;
 
   // A helper for applying third party cookie blocking rules.
   ContentSetting GetCookieSetting(
       const GURL& url,
       const GURL& first_party_url,
       bool setting_cookie,
@@ skipping 21 matching lines @@
   mutable base::Lock lock_;
 
   bool block_third_party_cookies_;
 
   DISALLOW_COPY_AND_ASSIGN(CookieSettings);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_COOKIE_SETTINGS_H_