Add an UMA stat to be able to see if the User pods are show on start screen,

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 0c8a30ddea89efa8c10f973f9e54cfaf2bcdd71b..5114cdac4bc376640ed7e3e0d34d21f02841782b 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -10,6 +10,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"

[Ilya Sherman, 2015/04/07 21:31:18]

nit: Please include histogram_macros instead

 #include "base/path_service.h"
 #include "base/prefs/pref_member.h"
 #include "base/prefs/pref_registry_simple.h"
@@ -1462,6 +1463,9 @@ void UserSessionManager::OnEasyUnlockKeyOpsFinished(
 
 void UserSessionManager::ActiveUserChanged(
     const user_manager::User* active_user) {
+  if (!user_manager::UserManager::Get()->IsCurrentUserNew())
+    SendUserPodsMetrics();
+
   Profile* profile = ProfileHelper::Get()->GetProfileByUser(active_user);
   // If profile has not yet been initialized, delay initialization of IME.
   if (!profile)
@@ -1586,4 +1590,27 @@ void UserSessionManager::InjectStubUserContext(
   authenticator_ = NULL;
 }
 
+void UserSessionManager::SendUserPodsMetrics() {
+  bool show_users_on_signin;
+  CrosSettings::Get()->GetBoolean(kAccountsPrefShowUserNamesOnSignIn,
+                                  &show_users_on_signin);
+  bool is_enterprise_managed = g_browser_process->platform_part()
+                                   ->browser_policy_connector_chromeos()
+                                   ->IsEnterpriseManaged();
+  UserPodsDisplay display;
+  if (show_users_on_signin) {
+    if (is_enterprise_managed)
+      display = USER_PODS_DISPLAY_ENABLED_MANAGED;
+    else
+      display = USER_PODS_DISPLAY_ENABLED_REGULAR;
+  } else {
+    if (is_enterprise_managed)
+      display = USER_PODS_DISPLAY_DISABLED_MANAGED;
+    else
+      display = USER_PODS_DISPLAY_DISABLED_REGULAR;
+  }
+  UMA_HISTOGRAM_ENUMERATION("UserSessionManager.UserPodsDisplay", display,
+                            NUM_USER_PODS_DISPLAY);
+}
+
 }  // namespace chromeos