Fix to enable the cached credentials login test

chrome/browser/automation/testing_automation_provider_chromeos.cc

Index: chrome/browser/automation/testing_automation_provider_chromeos.cc
diff --git a/chrome/browser/automation/testing_automation_provider_chromeos.cc b/chrome/browser/automation/testing_automation_provider_chromeos.cc
index f256a037360051355401675ca0fa3ae6a424255b..b69947e6bd0e83ced813b5b11708b905cb097e8e 100644
--- a/chrome/browser/automation/testing_automation_provider_chromeos.cc
+++ b/chrome/browser/automation/testing_automation_provider_chromeos.cc
@@ -361,8 +361,10 @@ void TestingAutomationProvider::SubmitLoginForm(DictionaryValue* args,
   AutomationJSONReply reply(this, reply_message);
 
   std::string username, password;
+  bool use_cached_credentials;
   if (!args->GetString("username", &username) ||
-      !args->GetString("password", &password)) {
+      !args->GetString("password", &password) ||
+      !args->GetBoolean("use_cached_credentials", &use_cached_credentials)) {
     reply.SendError("Invalid or missing args.");
     return;
   }
@@ -380,7 +382,11 @@ void TestingAutomationProvider::SubmitLoginForm(DictionaryValue* args,
   VLOG(2) << "TestingAutomationProvider::SubmitLoginForm "
           << "ShowSigninScreenForCreds(" << username << ", " << password << ")";
 
-  webui_login_display->ShowSigninScreenForCreds(username, password);
+  if (use_cached_credentials) {
+    webui_login_display->Login(username, password);
+  } else {
+    webui_login_display->ShowSigninScreenForCreds(username, password);
+  }
   reply.SendSuccess(NULL);
 }