Started measuring time for session restore process.

chrome/browser/chromeos/login/oauth2_login_manager.cc

Index: chrome/browser/chromeos/login/oauth2_login_manager.cc
diff --git a/chrome/browser/chromeos/login/oauth2_login_manager.cc b/chrome/browser/chromeos/login/oauth2_login_manager.cc
index e093f4254bbb326f734ec2f38c604bdd8348276c..4491b2443aadd968f86a28ffd876ae63e957ced1 100644
--- a/chrome/browser/chromeos/login/oauth2_login_manager.cc
+++ b/chrome/browser/chromeos/login/oauth2_login_manager.cc
@@ -216,6 +216,14 @@ void OAuth2LoginManager::SetSessionRestoreState(
     return;
 
   state_ = state;
+  if (state == OAuth2LoginManager::SESSION_RESTORE_FAILED) {
+    UMA_HISTOGRAM_TIMES("OAuth2Login.SessionRestoreTimeToFailure",
+                        base::Time::Now() - session_restore_start_);
+  } else if (state == OAuth2LoginManager::SESSION_RESTORE_DONE) {
+    UMA_HISTOGRAM_TIMES("OAuth2Login.SessionRestoreTimeToSuccess",
+                        base::Time::Now() - session_restore_start_);
+  }
+
   FOR_EACH_OBSERVER(Observer, observer_list_,
                     OnSessionRestoreStateChanged(user_profile_, state_));
 }