Changing the UsersPerSession UMA metric to only count possible multi profile sessions and do this u…

chrome/browser/chromeos/login/user_manager_impl.cc

Index: chrome/browser/chromeos/login/user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/user_manager_impl.cc b/chrome/browser/chromeos/login/user_manager_impl.cc
index 3046dd1261c1d967845350b5fa013b557dca3fe1..5340caea8cbe0951c045abffbd581c55297ace6c 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/user_manager_impl.cc
@@ -7,6 +7,7 @@
 #include <cstddef>
 #include <set>
 
+#include "ash/multi_profile_uma.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
@@ -2039,6 +2040,13 @@ void UserManagerImpl::DoUpdateAccountLocale(
 }
 
 void UserManagerImpl::UpdateNumberOfUsers() {
+  int users = GetLoggedInUsers().size();
+  if (users) {
+    // Write the user number as UMA stat when a multi user session is possible.
+    if ((users + GetUsersAdmittedForMultiProfile().size()) > 1)
+      ash::MultiProfileUMA::RecordUserCount(users);
+  }
+
   base::debug::SetCrashKeyValue(crash_keys::kNumberOfUsers,
       base::StringPrintf("%" PRIuS, GetLoggedInUsers().size()));
 }