Write last_modified date to Content Settings in the PrefProvider

components/content_settings/core/browser/content_settings_rule.h

 // Copyright (c) 2011 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.
 
 // Interface for objects providing content setting rules.
 
 #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/synchronization/lock.h"
+#include "base/time/time.h"
 #include "base/values.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 
 namespace content_settings {
 
 struct Rule {
   Rule();
   // Rule takes ownership of |value|.
   Rule(const ContentSettingsPattern& primary_pattern,
        const ContentSettingsPattern& secondary_pattern,
+       base::Time last_modified,
        base::Value* value);
   Rule(const Rule& other);
   ~Rule();
 
   ContentSettingsPattern primary_pattern;
   ContentSettingsPattern secondary_pattern;
+  base::Time last_modified;
   linked_ptr<base::Value> value;
 };
 
 class RuleIterator {
  public:
   virtual ~RuleIterator();
   virtual bool HasNext() const = 0;
   virtual Rule Next() = 0;
 };
 
 class ConcatenationIterator : public RuleIterator {
  public:
   // ConcatenationIterator takes ownership of the pointers in the |iterators|
   // list and |auto_lock|. |auto_lock| can be NULL if no locking is needed.
   ConcatenationIterator(std::vector<std::unique_ptr<RuleIterator>> iterators,
                         base::AutoLock* auto_lock);
   ~ConcatenationIterator() override;
   bool HasNext() const override;
   Rule Next() override;
 
  private:
   std::vector<std::unique_ptr<RuleIterator>> iterators_;
   std::unique_ptr<base::AutoLock> auto_lock_;
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_RULE_H_