Added keyboard shortcut on GAIA "Add User" screen to dogfood GAIA /EmbeddedSignin

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

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index 80749a84d84cf7600536ed0bc07ea654ee362d29..2e0688ef863abb40bcfa3b23a78c93fc67dd58f7 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -744,6 +744,8 @@ void SigninScreenHandler::RegisterMessages() {
   AddCallback("removeUser", &SigninScreenHandler::HandleRemoveUser);
   AddCallback("toggleEnrollmentScreen",
               &SigninScreenHandler::HandleToggleEnrollmentScreen);
+  AddCallback("switchToEmbeddedSignin",
+              &SigninScreenHandler::HandleSwitchToEmbeddedSignin);
   AddCallback("toggleKioskEnableScreen",
               &SigninScreenHandler::HandleToggleKioskEnableScreen);
   AddCallback("createAccount", &SigninScreenHandler::HandleCreateAccount);
@@ -1434,6 +1436,10 @@ void SigninScreenHandler::HandleGetTouchViewState() {
   }
 }
 
+void SigninScreenHandler::HandleSwitchToEmbeddedSignin() {
+  gaia_screen_handler_->SwitchToEmbeddedSignin();
+}
+
 bool SigninScreenHandler::AllWhitelistedUsersPresent() {
   CrosSettings* cros_settings = CrosSettings::Get();
   bool allow_new_user = false;