Add initial support for native Linux desktop notifications

chrome/browser/flag_descriptions.cc

Index: chrome/browser/flag_descriptions.cc
diff --git a/chrome/browser/flag_descriptions.cc b/chrome/browser/flag_descriptions.cc
index 63877eb6febaef5cfb98be3b192b88071265d96a..88923633131f2f621591d383bf3f42c6a6e66407 100644
--- a/chrome/browser/flag_descriptions.cc
+++ b/chrome/browser/flag_descriptions.cc
@@ -2889,4 +2889,13 @@ const char kEnableEhvInputDescription[] =
 
 #endif  // #if defined(OS_CHROMEOS)
 
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+const char kUseSystemNotificationsName[] =
+    "Use Freedesktop system notifications";
+
+const char kUseSystemNotificationsDescription[] =
+    "Send notifications to the notification center supplied by the Linux "
+    "desktop environment instead of using Chrome-rendered notifications.";
+#endif
+
 }  // namespace flag_descriptions