Add a single site view page to view and modify content settings.

chrome/browser/content_settings/content_settings_utils.h

Index: chrome/browser/content_settings/content_settings_utils.h
diff --git a/chrome/browser/content_settings/content_settings_utils.h b/chrome/browser/content_settings/content_settings_utils.h
index 7a7a1de8dd9583752fb85397fc517081abe4c96e..e3225261e48a9d86d796e7523ddf3807411dbdfb 100644
--- a/chrome/browser/content_settings/content_settings_utils.h
+++ b/chrome/browser/content_settings/content_settings_utils.h
@@ -31,6 +31,10 @@ std::string GetTypeName(ContentSettingsType type);
 bool GetTypeFromName(const std::string& name,
                      ContentSettingsType* return_setting);
 
+std::string ContentSettingToString(ContentSetting setting);
+
+ContentSetting ContentSettingFromString(const std::string& name);
+
 // Converts |Value| to |ContentSetting|.
 ContentSetting ValueToContentSetting(const base::Value* value);