Add UMA metrics for profile switching.

chrome/browser/profiles/profile_metrics.h

Index: chrome/browser/profiles/profile_metrics.h
diff --git a/chrome/browser/profiles/profile_metrics.h b/chrome/browser/profiles/profile_metrics.h
index ca42813ad7692421169c26a1985fe91312cfb5bd..aa732ff4970568477f6526efc5af27558aa84d4d 100644
--- a/chrome/browser/profiles/profile_metrics.h
+++ b/chrome/browser/profiles/profile_metrics.h
@@ -207,13 +207,15 @@ class ProfileMetrics {
   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,