Fix so that login errors are shown from login/oobe screens....

chrome/browser/chromeos/login/mock_authenticator.h

Index: chrome/browser/chromeos/login/mock_authenticator.h
===================================================================
--- chrome/browser/chromeos/login/mock_authenticator.h	(revision 71337)
+++ chrome/browser/chromeos/login/mock_authenticator.h	(working copy)
@@ -10,6 +10,7 @@
 
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/chromeos/login/authenticator.h"
+#include "chrome/browser/chromeos/login/background_view.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
 #include "chrome/common/net/gaia/google_service_auth_error.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -149,10 +150,19 @@
       const GaiaAuthConsumer::ClientLoginResult& credentials) {
   }
 
+  void SetBackgroundView(BackgroundView* background_view) {
+    background_view_ = background_view;
+  }
+
+  BackgroundView* GetBackgroundView() {
+    return background_view_;
+  }
+
  private:
   std::string expected_username_;
   std::string expected_password_;
   std::string auth_token_;
+  chromeos::BackgroundView* background_view_;
 
   DISALLOW_COPY_AND_ASSIGN(MockLoginUtils);
 };