Track adding a new user automatically.

chrome/browser/profiles/profile_metrics.h

 // Copyright (c) 2012 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_PROFILES_PROFILE_METRICS_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_METRICS_H_
 
 #include <stddef.h>
 #include <string>
 
@@ skipping 15 matching lines @@
     size_t supervised;
     size_t unused;
     size_t gaia_icon;
 
     ProfileCounts()
         : total(0), signedin(0), supervised(0), unused(0), gaia_icon(0) {}
   };
 
   // Enum for counting the ways users were added.
   enum ProfileAdd {
-    ADD_NEW_USER_ICON = 0,    // User adds new user from icon menu
-    ADD_NEW_USER_MENU,        // User adds new user from menu bar
-    ADD_NEW_USER_DIALOG,      // User adds new user from create-profile dialog
-    ADD_NEW_USER_MANAGER,     // User adds new user from User Manager
+    ADD_NEW_USER_ICON = 0,      // User adds new user from icon menu
+    ADD_NEW_USER_MENU,          // User adds new user from menu bar
+    ADD_NEW_USER_DIALOG,        // User adds new user from create-profile dialog
+    ADD_NEW_USER_MANAGER,       // User adds new user from User Manager
+    ADD_NEW_USER_LAST_DELETED,  // Auto-created after deleting last user
     NUM_PROFILE_ADD_METRICS
   };
 
   enum ProfileDelete {
     DELETE_PROFILE_SETTINGS = 0,  // Delete profile from settings page.
     DELETE_PROFILE_USER_MANAGER,  // Delete profile from User Manager.
     NUM_DELETE_PROFILE_METRICS
   };
 
   // Enum for counting the ways user profiles and menus were opened.
@@ skipping 166 matching lines @@
 
   // These functions should only be called on the UI thread because they hook
   // into g_browser_process through a helper function.
   static void LogProfileLaunch(Profile* profile);
   static void LogProfileSyncSignIn(const base::FilePath& profile_path);
   static void LogProfileUpdate(const base::FilePath& profile_path);
 };
 
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_METRICS_H_