UMA to track the reason for re-auth (draft).

components/user_manager/user_manager_base.cc

Index: components/user_manager/user_manager_base.cc
diff --git a/components/user_manager/user_manager_base.cc b/components/user_manager/user_manager_base.cc
index 2cee60b6d7984a004b968ea063f727709d524539..a8ee4b1f2ab2252e63559886bf4d9b9840f842f3 100644
--- a/components/user_manager/user_manager_base.cc
+++ b/components/user_manager/user_manager_base.cc
@@ -88,6 +88,9 @@ const char kUsingSAMLKey[] = "using_saml";
 // Key of Device Id.
 const char kDeviceId[] = "device_id";
 
+// Key of the reason for re-auth.
+const char kReauthReasonKey[] = "reauth_reason";
+
 // Upper bound for a histogram metric reporting the amount of time between
 // one regular user logging out and a different regular user logging in.
 const int kLogoutToLoginDelayMaxSec = 1800;
@@ -549,6 +552,16 @@ bool UserManagerBase::FindUsingSAML(const std::string& user_id) {
   return false;
 }
 
+void UserManagerBase::UpdateReauthReason(const std::string& user_id,
+                                         const int reauth_reason) {
+  SetKnownUserIntegerPref(user_id, kReauthReasonKey, reauth_reason);
+}
+
+bool UserManagerBase::FindReauthReason(const std::string& user_id,
+                                       int* out_value) {
+  return GetKnownUserIntegerPref(user_id, kReauthReasonKey, out_value);
+}
+
 void UserManagerBase::UpdateUserAccountData(
     const std::string& user_id,
     const UserAccountData& account_data) {
@@ -837,6 +850,7 @@ void UserManagerBase::EnsureUsersLoaded() {
     }
     user->set_oauth_token_status(LoadUserOAuthStatus(*it));
     user->set_force_online_signin(LoadForceOnlineSignin(*it));
+    user->set_using_saml(FindUsingSAML(*it));
     users_.push_back(user);
 
     base::string16 display_name;
@@ -1075,6 +1089,24 @@ void UserManagerBase::SetKnownUserBooleanPref(const UserID& user_id,
   UpdateKnownUserPrefs(user_id, dict, false);
 }
 
+bool UserManagerBase::GetKnownUserIntegerPref(const UserID& user_id,
+                                              const std::string& path,
+                                              int* out_value) {
+  const base::DictionaryValue* user_pref_dict = nullptr;
+  if (!FindKnownUserPrefs(user_id, &user_pref_dict))
+    return false;
+  return user_pref_dict->GetInteger(path, out_value);
+}
+
+void UserManagerBase::SetKnownUserIntegerPref(const UserID& user_id,
+                                              const std::string& path,
+                                              const int in_value) {
+  ListPrefUpdate update(GetLocalState(), kKnownUsers);
+  base::DictionaryValue dict;
+  dict.SetInteger(path, in_value);
+  UpdateKnownUserPrefs(user_id, dict, false);
+}
+
 void UserManagerBase::UpdateGaiaID(const UserID& user_id,
                                    const std::string& gaia_id) {
   SetKnownUserStringPref(user_id, kGAIAIdKey, gaia_id);