Log UMA metrics for multiprofile actions.

chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc

Index: chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc
diff --git a/chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc b/chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc
index fd27cd41130c7722446017b5460cbb2e2a3e56f8..79e3cc6eb50769c8675d00f6fad55211a083c7de 100644
--- a/chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc
+++ b/chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.h"
 
+#include "ash/multi_profile_uma.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ -25,6 +26,8 @@ AvatarMenuActionsChromeOS::~AvatarMenuActionsChromeOS() {
 
 void AvatarMenuActionsChromeOS::AddNewProfile(ProfileMetrics::ProfileAdd type) {
   // Let the user add another account to the session.
+  ash::MultiProfileUMA::RecordSigninUser(
+      ash::MultiProfileUMA::SIGNIN_USER_BY_BROWSER_FRAME);
   ash::Shell::GetInstance()->system_tray_delegate()->ShowUserLogin();
 }