Add Profile metric counting to new User Manager.

chrome/browser/profiles/avatar_menu.h

Index: chrome/browser/profiles/avatar_menu.h
diff --git a/chrome/browser/profiles/avatar_menu.h b/chrome/browser/profiles/avatar_menu.h
index b3af374dbb99f10b336cc22d0a3b39fd56b31a60..6679741c65634d75fb478d3b4fea6fec15e68f3b 100644
--- a/chrome/browser/profiles/avatar_menu.h
+++ b/chrome/browser/profiles/avatar_menu.h
@@ -94,7 +94,9 @@ class AvatarMenu : public content::NotificationObserver {
   // Opens a Browser with the specified profile in response to the user
   // selecting an item. If |always_create| is true then a new window is created
   // even if a window for that profile already exists.
-  void SwitchToProfile(size_t index, bool always_create);
+  void SwitchToProfile(size_t index,
+                       bool always_create,
+                       ProfileMetrics::ProfileOpen metric);
 
   // Creates a new profile.
   void AddNewProfile(ProfileMetrics::ProfileAdd type);