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.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SESSION_USER_SESSION_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SESSION_USER_SESSION_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 353 matching lines @@
   // Injects |user_context| that will be used to create StubAuthenticator
   // instance when CreateAuthenticator() is called.
   void InjectStubUserContext(const UserContext& user_context);
 
   // Controls whether browser instance should be launched after sign in
   // (used in tests).
   void set_should_launch_browser_in_tests(bool should_launch_browser) {
     should_launch_browser_ = should_launch_browser;
   }
 
+  // The user pods display type for histogram.
+  enum UserPodsDisplay {
+    // User pods enabling or disabling is possible either via local settings or
+    // via domain policy. The former method only applies to regular devices,
+    // whereas the latter is for enterprise-managed devices. Therefore, we have
+    // four possible combiations.
+    USER_PODS_DISPLAY_ENABLED_REGULAR = 0,
+    USER_PODS_DISPLAY_ENABLED_MANAGED = 1,
+    USER_PODS_DISPLAY_DISABLED_REGULAR = 2,
+    USER_PODS_DISPLAY_DISABLED_MANAGED = 3,
+    // Maximum histogram value.
+    NUM_USER_PODS_DISPLAY = 4
+  };
+
+  // Sends metrics for user pods display when existing user has logged in.
+  void SendUserPodsMetrics();
+
   UserSessionManagerDelegate* delegate_;
 
   // Authentication/user context.
   UserContext user_context_;
   scoped_refptr<Authenticator> authenticator_;
   StartSessionType start_session_type_;
 
   // Injected user context for stub authenticator.
   scoped_ptr<UserContext> injected_user_context_;
 
@@ skipping 49 matching lines @@
   bool waiting_for_child_account_status_;
 
   base::WeakPtrFactory<UserSessionManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserSessionManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SESSION_USER_SESSION_MANAGER_H_