ChromeOS: Add support for loading GAIA API v2

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

Index: chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
index eb45c93da9a701a1939377f0fce2b23336f1c0aa..e530027a98342f303884801e19bd05f6f774b049 100644
--- a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
@@ -348,6 +348,10 @@ void GaiaScreenHandler::LoadGaiaWithVersion(
     params.SetString("gaiaUrl", eafe_url);
     params.SetString("gaiaPath", eafe_path);
   }
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kCrosGaiaApiV1)) {
+    params.SetString("chromeOSApiVersion", "1");
+  }
 
   frame_state_ = FRAME_STATE_LOADING;
   CallJS("loadAuthExtension", params);