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..29b9df096f3839601b333c21c3a78c53ae0acb66 100644
--- a/chrome/browser/profiles/profile_metrics.h
+++ b/chrome/browser/profiles/profile_metrics.h
@@ -67,6 +67,16 @@ class ProfileMetrics {
     NUM_PROFILE_OPEN_METRICS
   };
 
+  // Enum for tracking the state of profiles being switched to.
+  enum ProfileOpenState {
+    // Profile being switched to is already opened and has browsers opened.
+    PROFILE_OPENED = 0,
+    // Profile being switched to is already opened but has no browsers opened.
+    PROFILE_OPENED_NO_BROWSER,
+    // Profile being switched to is not opened.
+    PROFILE_UNOPENED
+  };
+
   // Enum for getting net counts for adding and deleting users.
   enum ProfileNetUserCounts {
     ADD_NEW_USER = 0,         // Total count of add new user
@@ -206,14 +216,19 @@ class ProfileMetrics {
   // |manager|. This information is returned in the output variable |counts|.
   static bool CountProfileInformation(ProfileManager* manager,
                                       ProfileCounts* counts);
+  static ProfileOpenState GetProfileOpenState(ProfileManager* manager,

[Mike Lerman, 2015/01/23 19:46:14]

GetProfileOpenState isn't called outside of profile_metrics and is defined in
the anonymous namespace. You can remove it from the header file.

I think the ProfileOpenState enum can also be removed from the header file, and
declared in the .cc's anonymous namespace.

[anthonyvd, 2015/01/26 16:07:48]

Done.

+                                              const base::FilePath& path);
 
+  static void LogNumberOfProfileSwitches();
   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,
+                               ProfileManager* manager,
+                               const base::FilePath& profile_path);
   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,