Register a pref to control migration status

components/content_settings/core/common/pref_names.cc

Index: components/content_settings/core/common/pref_names.cc
diff --git a/components/content_settings/core/common/pref_names.cc b/components/content_settings/core/common/pref_names.cc
index ebcf7f0608e16f80c79dc52fc8ddf3e2599c2b08..1c74e586cf85c07138a780cee7cd7a2b713e9f34 100644
--- a/components/content_settings/core/common/pref_names.cc
+++ b/components/content_settings/core/common/pref_names.cc
@@ -18,6 +18,12 @@ const char kContentSettingsVersion[] = "profile.content_settings.pref_version";
 const char kContentSettingsWindowLastTabIndex[] =
     "content_settings_window.last_tab_index";
 
+// Integer that indicates which status currently is in of migrating domain
+// scoped settings.

[raymes, 2016/07/21 00:58:54]

nit: Integer that indicates the status of migrating domain scoped setting to
origin scoped settings.

[lshang, 2016/07/22 01:33:07]

Done.

+// TODO(lshang): Remove this when all migration is done. See crbug.com/621398.
+const char kDomainToOriginMigrationStatus[] =
+    "profile.content_settings.domain_to_origin_migration_status";
+
 // Preferences that are exclusively used to store managed values for default
 // content settings.
 const char kManagedDefaultCookiesSetting[] =