Introduces the notifier id for multi-profile notifications.

ash/system/system_notifier.cc

Index: ash/system/system_notifier.cc
diff --git a/ash/system/system_notifier.cc b/ash/system/system_notifier.cc
index bbd62c9488f0821c2677c938c83787ced87fd682..e4d65d27338fcfac3be006d1f8707f3968cc5387 100644
--- a/ash/system/system_notifier.cc
+++ b/ash/system/system_notifier.cc
@@ -27,6 +27,7 @@ const char* kAshSystemNotifiers[] = {
   kNotifierInputMethod,
   kNotifierLocale,
   kNotifierLocallyManagedUser,
+  kNotifierMultiProfileFirstRun,
   kNotifierNetwork,
   kNotifierNetworkError,
   kNotifierScreenshot,
@@ -57,6 +58,7 @@ const char kNotifierDisplayError[] = "ash.display.error";
 const char kNotifierInputMethod[] = "ash.input-method";
 const char kNotifierLocale[] = "ash.locale";
 const char kNotifierLocallyManagedUser[] = "ash.locally-managed-user";
+const char kNotifierMultiProfileFirstRun[] = "ash.multi-profile.first-run";
 const char kNotifierNetwork[] = "ash.network";
 const char kNotifierNetworkError[] = "ash.network.error";
 const char kNotifierScreenshot[] = "ash.screenshot";