Add login time metric for chromeos.

chrome/browser/chromeos/login/google_authenticator.cc

Index: chrome/browser/chromeos/login/google_authenticator.cc
diff --git a/chrome/browser/chromeos/login/google_authenticator.cc b/chrome/browser/chromeos/login/google_authenticator.cc
index fdde9cc16de46274872cd4560199e1e09cf4c003..95db42bc40070bf229f3f8cb099b6c788ca826f4 100644
--- a/chrome/browser/chromeos/login/google_authenticator.cc
+++ b/chrome/browser/chromeos/login/google_authenticator.cc
@@ -17,6 +17,7 @@
 #include "base/third_party/nss/sha256.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
+#include "chrome/browser/chromeos/browser_notification_observers.h"
 #include "chrome/browser/chromeos/cros/cryptohome_library.h"
 #include "chrome/browser/chromeos/login/auth_response_handler.h"
 #include "chrome/browser/chromeos/login/authentication_notification_details.h"
@@ -54,6 +55,10 @@ GoogleAuthenticator::GoogleAuthenticator(LoginStatusConsumer* consumer)
       unlock_(false),
       try_again_(true) {
   CHECK(chromeos::CrosLibrary::Get()->EnsureLoaded());
+
+  // This forces the creation of the login notification observer
+  // singleton.  It must be created to record login time.
+  chromeos::LogLoginSuccessObserver::Get();
 }
 
 GoogleAuthenticator::~GoogleAuthenticator() {}