Write last_modified date to Content Settings in the PrefProvider

components/content_settings/core/common/content_settings.h

Index: components/content_settings/core/common/content_settings.h
diff --git a/components/content_settings/core/common/content_settings.h b/components/content_settings/core/common/content_settings.h
index c441e280eaa5f42cf6c21b1bdbf04315ed740357..6fce4dca8288f6c469e5727c8d03e5cc74e3b27f 100644
--- a/components/content_settings/core/common/content_settings.h
+++ b/components/content_settings/core/common/content_settings.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include "base/time/time.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
@@ -44,6 +45,7 @@ struct ContentSettingPatternSource {
   ContentSettingPatternSource(const ContentSettingsPattern& primary_pattern,
                               const ContentSettingsPattern& secondary_patttern,
                               ContentSetting setting,
+                              base::Time last_modified,
                               const std::string& source,
                               bool incognito);
   ContentSettingPatternSource(const ContentSettingPatternSource& other);
@@ -51,6 +53,7 @@ struct ContentSettingPatternSource {
   ContentSettingsPattern primary_pattern;
   ContentSettingsPattern secondary_pattern;
   ContentSetting setting;
+  base::Time last_modified;
   std::string source;
   bool incognito;
 };