Add browser test for new user CrOS login flow

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 1092 matching lines @@
         l10n_util::GetStringUTF16(IDS_LOGIN_OFFLINE_SIGNIN));
     localized_strings->SetString("stringEmptyEmail",
         l10n_util::GetStringUTF16(IDS_LOGIN_OFFLINE_EMPTY_EMAIL));
     localized_strings->SetString("stringEmptyPassword",
         l10n_util::GetStringUTF16(IDS_LOGIN_OFFLINE_EMPTY_PASSWORD));
     localized_strings->SetString("stringError",
         l10n_util::GetStringUTF16(IDS_LOGIN_OFFLINE_ERROR));
     params.Set("localizedStrings", localized_strings);
   }
 
-  params.SetString("gaiaOrigin", GaiaUrls::GetInstance()->gaia_origin_url());
+  std::string gaia_origin = GaiaUrls::GetInstance()->gaia_origin_url();
+  if (!gaia_origin_for_test_.empty())
+    gaia_origin = gaia_origin_for_test_;
+  params.SetString("gaiaOrigin", gaia_origin);
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(::switches::kGaiaUrlPath)) {
     params.SetString("gaiaUrlPath",
         command_line->GetSwitchValueASCII(::switches::kGaiaUrlPath));
   }
 
   // Test automation data:
   if (command_line->HasSwitch(::switches::kAuthExtensionPath)) {
     if (!test_user_.empty()) {
       params.SetString("test_email", test_user_);
@@ skipping 624 matching lines @@
   if (!cros_settings)
     return false;
 
   // Offline login is allowed only when user pods are hidden.
   bool show_pods;
   cros_settings->GetBoolean(kAccountsPrefShowUserNamesOnSignIn, &show_pods);
   return !show_pods;
 }
 
 }  // namespace chromeos