Write last_modified date to Content Settings in the PrefProvider

components/content_settings/core/browser/content_settings_rule.h

Index: components/content_settings/core/browser/content_settings_rule.h
diff --git a/components/content_settings/core/browser/content_settings_rule.h b/components/content_settings/core/browser/content_settings_rule.h
index 8c24e60ccafd20e9bf15250c5ec93ca1b363dbe7..35c152abe8349811c7dc94d0af44cedaa8d31682 100644
--- a/components/content_settings/core/browser/content_settings_rule.h
+++ b/components/content_settings/core/browser/content_settings_rule.h
@@ -13,6 +13,7 @@
 #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"
 
@@ -23,12 +24,14 @@ struct 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;
 };