Add UMA metrics for profile switching.

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 189 matching lines @@
     PROFILE_AVATAR_MENU_UPGRADE_NOT_YOU,
     NUM_PROFILE_AVATAR_MENU_UPGRADE_METRICS,
   };
 
   static void UpdateReportedProfilesStatistics(ProfileManager* manager);
   // Count and return summary information about the profiles currently in the
   // |manager|. This information is returned in the output variable |counts|.
   static bool CountProfileInformation(ProfileManager* manager,
                                       ProfileCounts* counts);
 
+  static void IncrementNumberOfSwitches();

[Mike Lerman, 2015/01/21 20:58:03]

IncrementNumberOfSwitches is only ever called locally - doesn't need to be in
the header file.

[anthonyvd, 2015/01/23 16:01:31]

Done.

+  static void LogNumberOfSwitches();

[Mike Lerman, 2015/01/21 20:58:03]

Please specify - either call it LogNumberOfProfileSwitches or
LogProfileNumberOfSwitches.

[anthonyvd, 2015/01/23 16:01:31]

Done.

   static void LogNumberOfProfiles(ProfileManager* manager);
   static void LogProfileAddNewUser(ProfileAdd metric);
   static void LogProfileAvatarSelection(size_t icon_index);
   static void LogProfileDeleteUser(ProfileDelete metric);
   static void LogProfileOpenMethod(ProfileOpen metric);
+  static void LogProfileSwitch(ProfileOpen metric, bool profile_already_open);
   static void LogProfileSwitchGaia(ProfileGaia metric);
-  static void LogProfileSwitchUser(ProfileOpen metric);
   static void LogProfileSyncInfo(ProfileSync metric);
   static void LogProfileAuthResult(ProfileAuth metric);
   static void LogProfileDesktopMenu(ProfileDesktopMenu metric,
                                     signin::GAIAServiceType gaia_service);
   static void LogProfileDelete(bool profile_was_signed_in);
   static void LogProfileNewAvatarMenuNotYou(ProfileNewAvatarMenuNotYou metric);
   static void LogProfileNewAvatarMenuSignin(ProfileNewAvatarMenuSignin metric);
   static void LogProfileNewAvatarMenuUpgrade(
       ProfileNewAvatarMenuUpgrade metric);
 
 #if defined(OS_ANDROID)
   static void LogProfileAndroidAccountManagementMenu(
       ProfileAndroidAccountManagementMenu metric,
       signin::GAIAServiceType gaia_service);
 #endif  // defined(OS_ANDROID)
 
   // 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_