Write last_modified date to Content Settings in the PrefProvider

components/content_settings/core/browser/content_settings_pref.h

 // 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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
+#include "base/time/time.h"
 #include "base/values.h"
 #include "components/content_settings/core/browser/content_settings_origin_identifier_value_map.h"
 #include "components/content_settings/core/browser/content_settings_provider.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 class PrefService;
 class PrefChangeRegistrar;
 
 namespace base {
@@ skipping 10 matching lines @@
   typedef base::Callback<void(const ContentSettingsPattern&,
                               const ContentSettingsPattern&,
                               ContentSettingsType,
                               const std::string&)> NotifyObserversCallback;
 
   ContentSettingsPref(ContentSettingsType content_type,
                       PrefService* prefs,
                       PrefChangeRegistrar* registrar,
                       const std::string& pref_name,
                       bool incognito,
+                      bool store_last_modified,
                       NotifyObserversCallback notify_callback);
   ~ContentSettingsPref();
 
   // Returns nullptr to indicate the RuleIterator is empty.
   std::unique_ptr<RuleIterator> GetRuleIterator(
       const ResourceIdentifier& resource_identifier,
       bool incognito) const;
 
   bool SetWebsiteSetting(const ContentSettingsPattern& primary_pattern,
                          const ContentSettingsPattern& secondary_pattern,
                          const ResourceIdentifier& resource_identifier,
                          base::Value* value);
 
+  // Returns the |last_modified| date of a setting.
+  base::Time GetWebsiteSettingLastModified(
+      const ContentSettingsPattern& primary_pattern,
+      const ContentSettingsPattern& secondary_pattern,
+      const ResourceIdentifier& resource_identifier);
+
   void ClearPref();
 
   void ClearAllContentSettingsRules();
 
   size_t GetNumExceptions();
 
   // Tries to lock |lock_|. If successful, returns true and releases the lock.
   bool TryLockForTesting() const;
 
  private:
   // Reads all content settings exceptions from the preference and loads them
   // into the |value_map_|. The |value_map_| is cleared first.
   void ReadContentSettingsFromPref();
 
   // Callback for changes in the pref with the same name.
   void OnPrefChanged();
 
   // Update the preference that stores content settings exceptions and syncs the
   // value to the obsolete preference. When calling this function, |lock_|
   // should not be held, since this function will send out notifications of
   // preference changes.
-  void UpdatePref(
-      const ContentSettingsPattern& primary_pattern,
-      const ContentSettingsPattern& secondary_pattern,
-      const ResourceIdentifier& resource_identifier,
-      const base::Value* value);
+  void UpdatePref(const ContentSettingsPattern& primary_pattern,
+                  const ContentSettingsPattern& secondary_pattern,
+                  const ResourceIdentifier& resource_identifier,
+                  const base::Time last_modified,
+                  const base::Value* value);
 
   static void CanonicalizeContentSettingsExceptions(
       base::DictionaryValue* all_settings_dictionary);
 
   // In the debug mode, asserts that |lock_| is not held by this thread. It's
   // ok if some other thread holds |lock_|, as long as it will eventually
   // release it.
   void AssertLockNotHeld() const;
 
   // The type of content settings stored in this pref.
   ContentSettingsType content_type_;
 
   // Weak; owned by the Profile and reset in ShutdownOnUIThread.
   PrefService* prefs_;
 
   // Owned by the PrefProvider.
   PrefChangeRegistrar* registrar_;
 
   // Name of the dictionary preference managed by this class.
   const std::string& pref_name_;
 
   bool is_incognito_;
 
+  bool store_last_modified_;
+
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
   OriginIdentifierValueMap value_map_;
 
   OriginIdentifierValueMap incognito_value_map_;
 
   NotifyObserversCallback notify_callback_;
 
   // Used around accesses to the value map objects to guarantee thread safety.
   mutable base::Lock lock_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsPref);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_PREF_H_